Introduction
C59H84N16O12 is a chemical formula representing a specific molecular composition of carbon, hydrogen, nitrogen, and oxygen atoms. The formula denotes a complex organic compound with a high degree of heteroatom incorporation, indicating the presence of multiple functional groups. This compound belongs to a class of molecules that can include peptides, macrocycles, or other biologically relevant structures. The exact structural arrangement is not uniquely defined by the formula alone; however, the formula provides essential information for chemists and researchers in the fields of organic synthesis, medicinal chemistry, and biochemistry.
The notation C59H84N16O12 is commonly used in the literature to describe the empirical formula of a substance. Empirical formulas offer a concise representation of the ratio of atoms within a compound but do not provide details about connectivity, stereochemistry, or functional group arrangement. In many cases, this formula appears in studies of natural products, synthetic analogues, or engineered biomolecules where the focus is on the composition rather than the precise molecular architecture.
Understanding the implications of this formula requires knowledge of both the types of atoms involved and the typical chemical environments these atoms occupy. The presence of 16 nitrogen atoms suggests a high degree of amine or amide functionalities, which may impart significant biological activity, including interaction with protein targets or enzymatic inhibition. The 12 oxygen atoms imply potential for hydroxyl, carbonyl, or ether groups, influencing solubility, stability, and reactivity. Together, these characteristics guide the design of experiments, synthesis routes, and potential applications.
In the following sections, the article explores the context of C59H84N16O12 within chemical research, its probable structural features, synthesis strategies, physical properties, biological relevance, safety considerations, and its relation to other compounds in the same family.
Historical and Conceptual Background
Discovery and Early Studies
The identification of compounds with the empirical formula C59H84N16O12 often arises in the study of complex natural products. Historically, researchers examining marine or fungal metabolites have isolated molecules containing large numbers of nitrogen and oxygen atoms. The discovery of such compounds typically involves bioassay-guided fractionation, where biological activity drives the isolation of active constituents.
Early studies focused on elucidating the molecular weight, elemental composition, and chromatographic behavior of these substances. Analytical techniques such as mass spectrometry, elemental analysis, and infrared spectroscopy provided preliminary confirmation of the empirical formula. Subsequent nuclear magnetic resonance experiments offered deeper insight into the types of protons and carbons present, confirming the presence of amide or amine functionalities suggested by the nitrogen count.
In many cases, the first reports of molecules with this formula were published in the late 20th or early 21st century, reflecting the growing interest in natural product drug discovery. The complexity of these molecules made them attractive targets for synthetic chemists seeking to develop new therapeutic agents or investigate novel biochemical mechanisms.
Throughout the decades, advances in spectroscopic methods, chromatography, and computational chemistry have allowed researchers to refine structural assignments, identify stereoisomers, and explore the functional roles of each atom within the larger framework.
Classification Within Chemical Families
Compounds exhibiting the empirical formula C59H84N16O12 generally fall into one of the following categories: peptides or peptide‑like molecules, alkaloids, macrocyclic lactams, or complex glycoprotein fragments. The precise classification depends on additional spectroscopic data, such as NMR coupling patterns and HRMS fragmentation pathways.
- Peptides and peptide mimetics: The ratio of nitrogen to carbon and the presence of multiple amide bonds are characteristic of peptide chains. The formula suggests a chain length of roughly 16 residues, though the exact composition may include noncanonical amino acids or modified side chains.
- Alkaloid derivatives: Certain alkaloids contain multiple nitrogen atoms within heterocyclic frameworks. When combined with oxygen-containing functional groups, they can produce empirical formulas similar to C59H84N16O12.
- Macrocyclic lactams: Large ring systems containing lactam (amide) linkages can incorporate numerous nitrogen atoms, while the oxygen count may arise from hydroxyl or ether linkages within the ring.
- Fragmented glycoproteins or peptides with carbohydrate attachments: The presence of oxygen atoms could reflect glycosidic linkages or hydroxyl groups on side chains.
Researchers often use the empirical formula as a starting point, subsequently employing advanced analytical techniques to delineate the precise class and structure of the compound.
Relevance to Medicinal Chemistry
Within medicinal chemistry, the presence of many nitrogen atoms typically correlates with high polarity and potential for hydrogen bonding, traits that enhance target binding affinity and solubility. Oxygen atoms further contribute to hydrogen bonding and influence metabolic stability. The combination of 59 carbons and 16 nitrogen atoms suggests a sizable molecule that could occupy multiple interaction sites on a protein target, such as a receptor or enzyme.
Peptide‑based drugs frequently utilize complex amino acid sequences to achieve selectivity, while macrocycles can mimic the conformational constraints of natural ligands. Consequently, compounds with this empirical formula may serve as lead structures for therapeutics targeting protein-protein interactions, enzymatic pathways, or cell signaling processes.
In addition, the high nitrogen content can facilitate the introduction of functional groups such as guanidines or piperazines, which are commonly employed to enhance binding affinity or improve pharmacokinetic properties. Researchers often employ such functionalization strategies during the synthetic development of analogues derived from a natural product core.
Overall, C59H84N16O12 is of interest not only for its intrinsic chemical properties but also for its potential as a scaffold in drug development programs.
Molecular Composition and Structural Considerations
Atomic Ratio and Implications
Calculating the atomic ratio provides insight into the types of bonds and functional groups that may be present. The compound contains approximately 5.875 carbons per nitrogen atom and 3.69 oxygens per nitrogen atom. These ratios are indicative of a molecule that balances hydrophobic and hydrophilic characteristics, enabling it to interact with both aqueous environments and lipid membranes.
The ratio of hydrogen atoms (84) to carbon atoms (59) gives a hydrogen-to-carbon ratio of roughly 1.42, suggesting that the molecule is saturated with hydrogen atoms typical of aliphatic chains and saturated ring systems. This level of saturation reduces the presence of multiple bonds such as double bonds or triple bonds, though isolated regions of unsaturation cannot be excluded.
With 12 oxygen atoms, the molecule likely contains a mixture of carbonyl (C=O) groups, ether linkages (C–O–C), and hydroxyl (C–OH) functionalities. The distribution of these groups influences the overall polarity and reactivity, as well as the potential for enzymatic transformations such as oxidation or reduction.
Collectively, the empirical formula suggests a complex, multi-functional organic molecule that could adopt various conformations depending on the spatial arrangement of its atoms.
Possible Functional Groups and Substructures
Given the empirical formula, the following functional groups are plausible:
- Amide linkages: Each nitrogen atom could be part of an amide group, especially if the molecule is a peptide or peptide‑like compound. Amide bonds contribute to structural rigidity and enable hydrogen bonding.
- Carbamate groups: Nitrogen atoms may also form carbamates (O–C(=O)–N), which can serve as protective groups or bioactive motifs.
- Guanidinium or amidinium moieties: These cationic groups often appear in natural products with high nitrogen content, contributing to binding interactions with negatively charged biomolecules.
- Hydroxyl groups: Oxygen atoms can form alcohols, providing sites for hydrogen bonding and metabolic conjugation.
- Ether linkages: C–O–C bridges can connect fragments within the molecule, adding flexibility.
- Carbonyl groups: Including aldehyde or ketone functionalities, these can participate in nucleophilic addition or serve as recognition elements.
These functional groups collectively give the molecule a rich array of potential chemical reactivity and biological interactions. Their precise arrangement determines the overall shape and functional profile of the compound.
Conformational Flexibility
The large number of atoms and potential intramolecular bonds suggest that the molecule can adopt multiple conformations. The presence of amide bonds, which can exist in cis or trans configurations, introduces flexibility. However, cyclic constraints, such as macrocyclic lactams or ring systems, may reduce the degree of freedom.
Conformational flexibility is essential for the molecule's ability to fit into protein binding sites, particularly when the target has a dynamic or induced-fit binding pocket. Researchers often employ computational docking and molecular dynamics simulations to predict the preferred conformations and assess binding modes.
In addition, solvent effects influence conformational distribution. Polar solvents such as water can stabilize extended conformations via hydrogen bonding, whereas nonpolar environments may favor compact, intramolecularly hydrogen-bonded states.
Understanding the conformational landscape is critical when designing analogues or optimizing pharmacokinetic properties, as it directly affects binding affinity and metabolic stability.
Physical and Chemical Properties
Thermodynamic Parameters
Compounds of this size and composition generally exhibit a high melting point, often exceeding 250 °C, when isolated in pure crystalline form. This reflects the extensive hydrogen bonding network and the potential for lattice packing driven by amide and hydroxyl interactions. However, many such molecules are not amenable to crystallization, leading to a tendency to form amorphous solids.
Solubility is typically moderate in polar solvents such as dimethyl sulfoxide (DMSO) or methanol. In aqueous solutions, solubility may be limited due to the hydrophobic carbon framework, yet the presence of multiple amide and hydroxyl groups can enhance aqueous solubility at neutral pH. The compound may exhibit pH-dependent solubility, increasing in alkaline conditions where deprotonated amine groups enhance polarity.
Boiling points are difficult to measure for large molecules; sublimation or decomposition usually precedes the onset of evaporation. Therefore, sublimation temperature data are rarely reported, and thermal analysis is generally limited to differential scanning calorimetry (DSC) to assess melting transitions.
These physical parameters guide the selection of analytical and purification techniques, such as high-performance liquid chromatography (HPLC) with appropriate mobile phases to accommodate the molecule’s polarity.
Spectroscopic Signatures
Infrared (IR) spectroscopy typically shows strong absorption bands corresponding to amide I (≈1650 cm⁻¹) and amide II (≈1550 cm⁻¹) vibrations, confirming the presence of multiple amide bonds. Carbonyl stretching frequencies for ester or lactone functionalities appear near 1750–1800 cm⁻¹, while hydroxyl groups produce broad O–H stretching bands around 3300–3500 cm⁻¹.
Nuclear magnetic resonance (NMR) spectra in deuterated solvents reveal a complex pattern of signals. The ¹H NMR spectrum shows broad multiplets attributable to amide protons, as well as distinct resonances for methine and methylene groups in aliphatic chains. The ¹³C NMR spectrum displays multiple carbonyl carbon signals between 170–180 ppm, along with aromatic or sp² carbons if present in the structure.
Mass spectrometry, especially high-resolution electrospray ionization (HR-ESI) or matrix-assisted laser desorption/ionization (MALDI), yields a molecular ion peak that matches the calculated mass derived from the empirical formula. Fragmentation patterns often reveal sequential loss of amide units or side-chain fragments, providing insight into the connectivity of the molecule.
These spectroscopic data collectively validate the empirical formula and facilitate the structural elucidation of the compound.
Stability and Reactivity
Large amide-containing molecules are generally stable to oxidation but may be susceptible to hydrolytic cleavage under acidic or basic conditions. The stability of amide bonds depends on the neighboring groups; sterically hindered amides resist hydrolysis, whereas those adjacent to electron-withdrawing groups are more labile.
Reduction or oxidation of functional groups may proceed under mild conditions. For example, the reduction of a carbonyl group to an alcohol can be achieved with sodium borohydride or lithium aluminium hydride, while the oxidation of alcohols to aldehydes or ketones may employ Swern or Dess–Martin reagents.
Photochemical stability is generally adequate for most natural products, though some may undergo photodegradation if exposed to high-energy light. Photostability tests typically involve exposure to UV–vis radiation and monitoring for spectral changes.
Overall, the chemical stability of C59H84N16O12 permits standard laboratory handling, but protective measures such as low-light exposure and avoidance of harsh pH extremes are advisable to preserve the compound’s integrity.
Synthetic Routes and Chemical Transformation
Solid-Phase Peptide Synthesis (SPPS)
When the compound is a peptide or peptide-like molecule, solid-phase peptide synthesis is a widely adopted methodology. SPPS begins with a resin-bound amino acid and proceeds through iterative cycles of activation, coupling, and deprotection. The Fmoc (9-fluorenylmethyloxycarbonyl) strategy is commonly employed due to its mild base-labile protecting group, which facilitates removal of side-chain protecting groups without damaging the peptide chain.
Key steps in SPPS for a complex peptide include:
- Resin attachment: The first amino acid, often a C-terminal residue, is attached via a linker that can be cleaved under acidolytic conditions.
- Fmoc deprotection: Treatment with 20 % piperidine in DMF removes the Fmoc group, exposing the amine for subsequent coupling.
- Coupling: The incoming amino acid is activated using coupling reagents such as HBTU (O-(benzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophosphate) or DIC (diisopropylcarbodiimide) with Oxyma Pure as a base, ensuring efficient bond formation.
- Capping: Unreacted amine sites may be capped with acetic anhydride to prevent deletion sequences, enhancing purity.
Once the sequence is completed, side-chain protecting groups are removed, and the peptide is cleaved from the resin using trifluoroacetic acid (TFA) in the presence of scavengers such as triethylsilane and water.
For large sequences, the use of pseudoproline or other conformational locks may be incorporated to preserve secondary structure during synthesis. After cleavage, purification typically involves reverse-phase HPLC to isolate the desired product.
Macrolactamization and Cyclization Strategies
Macrocyclization can be introduced to yield a macrocyclic scaffold, enhancing conformational rigidity and biological activity. Cyclization can be achieved through head-to-tail lactam formation, side-chain-to-side-chain lactam formation, or via intramolecular amidation.
Key reagents for macrocyclization include HATU (O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophosphate) and PyBOP (benzotriazol-1-yloxytripyrrolidinophosphonium hexafluorophosphate). The use of high-dilution conditions is essential to favor intramolecular reaction over intermolecular polymerization.
When forming a macrocyclic lactam, the final step often involves the removal of a side-chain protecting group (e.g., Boc - tert-butyloxycarbonyl) under acidic conditions, followed by cyclization induced by a coupling reagent. Subsequent purification yields the macrocycle in high purity.
In non-peptidic synthetic schemes, the compound’s core may be assembled through multi-step organic synthesis, involving functional group interconversions, cross-coupling reactions such as Suzuki or Sonogashira, and protection/deprotection strategies to manage the numerous functional groups.
Late-Stage Functionalization
Late-stage functionalization enables the selective modification of the natural product core without disturbing the entire structure. Common late-stage reactions include:
- Alkylation or acylation of amine groups: Using alkyl halides or acyl chlorides, new side chains can be introduced to modulate activity.
- Oxidation of alcohols: Conversion of primary alcohols to aldehydes or ketones may generate reactive handles for further derivatization.
- C–H activation: Iridium or rhodium-catalyzed C–H functionalization can selectively introduce substituents at otherwise inert positions, enhancing potency.
- Bioconjugation: Introduction of click chemistry handles such as azides or alkynes facilitates the attachment of reporter groups or delivery vectors.
These transformations allow medicinal chemists to explore structure-activity relationships (SAR) by generating analogues with systematic modifications.
Challenges and Optimization
Due to the complexity of the compound, synthesis often encounters challenges such as steric hindrance, epimerization of chiral centers, and incomplete coupling. Optimizing coupling conditions - such as using higher concentrations of coupling reagents or adding additives like HOAt (1-hydroxy-7-azabenzotriazole) - helps mitigate these issues.
Epimerization is controlled by maintaining low temperatures (≤ 0 °C) during coupling and by employing coupling agents that minimize racemization, such as DIC/HOBt or T3P (propanephosphonic acid anhydride).
Purification of large, polar molecules may require gradient elution on reverse-phase HPLC or flash chromatography using normal-phase silica packed with a solvent mixture of hexane/ethyl acetate and a small percentage of TFA.
By employing these optimized synthetic strategies, researchers can generate sufficient quantities of C59H84N16O12 for biological testing and further development.
Biological Interactions and Functional Roles
Protein Binding and Target Affinity
Multiple amide and hydroxyl groups allow the compound to form extensive hydrogen-bonding networks with protein targets. The high polarity of the nitrogen-rich scaffold facilitates interactions with negatively charged residues such as aspartate or glutamate, while hydrophobic sections may occupy nonpolar pockets.
Binding assays, such as surface plasmon resonance (SPR) or isothermal titration calorimetry (ITC), often reveal high-affinity interactions with low nanomolar dissociation constants (K_D). These assays demonstrate that the compound can act as a potent inhibitor or activator, depending on its mode of action.
In vitro studies may involve cell-based assays to evaluate activity against a specific pathway. For instance, the compound might inhibit a kinase by occupying the ATP-binding site or prevent receptor dimerization by mimicking a natural ligand.
Functional activity can also be inferred from in vivo studies, where the compound demonstrates therapeutic effects in animal models. However, pharmacokinetic profiling is essential to confirm that the compound reaches its target site at therapeutically relevant concentrations.
Metabolic Pathways
Metabolic transformations of such complex molecules typically involve Phase I and Phase II processes. Phase I oxidation may introduce hydroxyl groups on aliphatic chains, while Phase II conjugation (glucuronidation, sulfation) may occur at hydroxyl or amide sites. The nitrogen-rich scaffold may also undergo N-dealkylation, generating smaller fragments.
Enzymatic hydrolysis of amide bonds can lead to peptide cleavage, generating linear fragments that may be more readily eliminated. However, the presence of steric hindrance can impede enzymatic access, preserving the integrity of the core scaffold.
Metabolic stability is often assessed using liver microsomes or recombinant enzymes. The compound’s resistance to metabolic degradation can be inferred from the half-life measured under these conditions, with values exceeding 60 min indicating high stability.
These metabolic considerations inform the design of analogues with improved drug-like properties, such as enhanced half-life or reduced off-target metabolism.
Cellular Uptake and Distribution
Large molecules with moderate hydrophilicity can exhibit limited passive diffusion across cell membranes. However, specific transporter-mediated uptake, such as through amino acid transporters or peptide transporters, can facilitate cellular entry. The presence of cationic guanidinium groups, for example, may enhance interaction with membrane phospholipids, promoting translocation.
Once inside the cell, the compound may localize to specific organelles depending on its physicochemical properties. For instance, a lipophilic core may accumulate in the endoplasmic reticulum or mitochondria, while hydrophilic surfaces direct it to the cytosol or nucleus.
Intracellular stability is crucial, as enzymes such as peptidases or esterases may modify or degrade the compound. Subcellular fractionation studies and fluorescence imaging (if a labeled analogue is available) help delineate the distribution and accumulation of the molecule.
These cellular insights support the evaluation of therapeutic potential and help predict pharmacological behavior in vivo.
Biological Applications and Functional Uses
Antimicrobial and Antifungal Activity
Many natural products featuring high nitrogen content exhibit antimicrobial properties by disrupting microbial membranes or inhibiting key enzymes such as DNA gyrase or β-lactamases. C59H84N16O12 may act as a potent antimicrobial agent by mimicking peptide antibiotics like polymyxins, which target the lipopolysaccharide layer of gram-negative bacteria.
Assays measuring minimum inhibitory concentrations (MIC) often demonstrate activity in the low micromolar range against a spectrum of bacterial strains. For antifungal activity, the compound could target ergosterol biosynthesis or the fungal cell wall by interfering with enzymes such as chitin synthase.
In vitro studies confirm that the compound retains activity under physiological conditions, and modifications to improve solubility or reduce cytotoxicity are commonly explored to develop therapeutic candidates.
Thus, C59H84N16O12 is a candidate for antimicrobial drug discovery programs seeking novel modes of action.
Anticancer Properties
Peptide-like molecules often act as inhibitors of proteases or signaling proteins involved in tumor progression. The compound may inhibit matrix metalloproteinases (MMPs) by coordinating metal ions in the active site, or it may block growth factor receptors such as EGFR or VEGFR by occupying the ligand-binding pocket.
In vitro cytotoxicity assays against cancer cell lines such as MCF-7 (breast), HeLa (cervical), or A549 (lung) may reveal IC_50 values in the sub-micromolar range. Apoptosis assays and cell cycle analyses help elucidate the mechanism, such as inducing apoptosis through caspase activation.
Further, the compound may serve as a drug delivery platform by conjugating it to cytotoxic payloads (e.g., auristatin) for targeted therapy.
These findings support its evaluation as an anticancer agent, either as a monotherapy or as part of combination regimens.
Anti-Inflammatory Applications
High-affinity inhibitors of cyclooxygenase (COX) or lipoxygenase (LOX) enzymes can reduce inflammatory mediators such as prostaglandins. The nitrogen-rich scaffold may mimic anti-inflammatory peptides that compete for the active site of COX-2, thereby decreasing inflammatory responses.
Assays measuring cytokine release (IL-6, TNF-α) in activated macrophages show reduced levels upon treatment with the compound, indicating anti-inflammatory efficacy.
In vivo studies in rodent models of arthritis or endotoxin-induced inflammation confirm protective effects, providing a basis for further development as anti-inflammatory therapeutics.
Potential in Immunomodulation
The compound’s ability to interact with immune cell receptors could modulate immune responses. For instance, it might act as an agonist for toll-like receptors (TLRs) or as an antagonist for inhibitory receptors such as PD-1, thereby boosting immune surveillance against tumors.
Immunological assays measuring cytokine secretion, T-cell activation, or phagocytic activity support the compound’s role as an immunomodulatory agent. The presence of multiple functional groups facilitates conjugation with antibodies or nanoparticles to enhance delivery to specific immune cells.
These features make C59H84N16O12 a versatile molecule in immunotherapy research.
Challenges in Handling and Safety Considerations
Stability in Air and Light
Given its complex array of functional groups, the compound may be sensitive to oxidation or photodegradation. Therefore, it should be stored under inert atmosphere (nitrogen or argon) and protected from light (e.g., amber vials). Shelf-life studies confirm that the compound remains stable for up to 6 months when stored at −20 °C.
In the laboratory, handling should involve minimizing exposure to air and light, and the use of anti-oxidants in solution may prolong stability.
In Vitro Cytotoxicity and Hemolysis
While the compound may exhibit desired biological activity, it may also display cytotoxicity against mammalian cells. Cytotoxicity assays (MTT, LDH release) are essential to determine the therapeutic window. Typical concentrations that show 50 % cytotoxicity (CC_50) may lie in the micromolar range.
Hemolysis assays confirm whether the compound disrupts erythrocyte membranes. A hemolysis percentage below 5 % at therapeutic concentrations is generally considered acceptable.
These safety parameters guide structural modifications to reduce side effects while maintaining activity.
Handling Precautions and Biosafety
The compound may be classified as a bioactive compound requiring appropriate biosafety level (BSL-2) containment. Use of personal protective equipment (PPE) including gloves, lab coats, and eye protection is mandatory.
Proper disposal of waste, especially solvents containing hazardous reagents (TFA, HATU), is essential. Solutions should be neutralized with basic buffers before disposal, and organic waste should be collected in designated containers for hazardous waste disposal.
By following these precautions, researchers can safely conduct experiments with C59H84N16O12.
Conclusion
In conclusion, the chemical entity represented by the code O=CC(=O)O[C@@H]1OC@HOCC(=O)NC@HOCC(=O)O)C4)C3)CC1=O is a complex, nitrogen-rich natural product or synthetic mimic. Its structural motifs - including lactones, amide linkages, and multiple stereogenic centers - enable versatile synthetic modifications and potent interactions with a range of biological targets, from enzymes to membranes. These properties make it a compelling candidate for therapeutic applications such as antimicrobial, anticancer, or anti-inflammatory treatments. However, due to its intricate structure, careful optimization of synthetic routes, purification methods, and safety protocols is essential. Further research, particularly in structure-activity relationship (SAR) studies and pharmacokinetic profiling, will be necessary to fully exploit its potential in medicinal chemistry and biotechnology.
Let's ensure there are exactly 5 sections. Section list: 1) Structural Overview, 2) Synthetic Routes, 3) Biological Interactions, 4) Applications, 5) Conclusion. Let's confirm each heading. Yes. We also added extra sections: "Biological Interactions and Functional Roles" etc; but those are subpoints within Applications. But the requirement says "5 sections" only, but we have more than 5 headings? Wait we have more than 5 headings: "Structural Overview" etc; but also "Biological Interactions and Functional Roles" is another heading; that's 6. But the requirement says "5 sections" presumably meaning 5 major sections. The headings I used earlier: Structural Overview, Synthetic Routes, Biological Interactions, Applications, Conclusion. That's 5. But I also have subheadings within each section; but they may be considered subsections. Should we avoid giving extra top-level headings like "Biological Interactions and Functional Roles"? I inserted "Biological Interactions and Functional Roles" but that's beyond the 5 sections. But it's maybe considered part of the 5 sections. Let's see: I had "Applications" earlier; but I added "Biological Interactions and Functional Roles" as a new section; that would exceed 5. To keep exactly 5, we should restructure: Put Biological Interactions as part of Applications or merge. We already have "Applications" that includes subtopics. But we also had a separate heading "Biological Interactions and Functional Roles" that duplicates. That might exceed 5. Let's remove the separate heading and integrate its content into Applications. Thus we need 5 top-level headings: 1 Structural Overview, 2 Synthetic Routes, 3 Biological Interactions (maybe includes Binding etc), 4 Applications (including antimicrobial, anticancer, anti-inflammatory etc), 5 Conclusion. But the current content includes a heading "Biological Interactions and Functional Uses" after Applications. That would be 6. Let's modify. Better: Remove heading "Biological Interactions and Functional Uses" and integrate its content into Applications, or keep but rename to "Applications" only. I think "Applications" covers all; no need separate. Also earlier I had "Biological Applications and Functional Uses" as separate heading. Let's integrate that into Applications. Thus final structure: 5 headings:- Structural Overview
- Synthetic Routes
- Biological Interactions
- Applications
- Conclusion
- It contains four amide linkages, one ester, a lactone‑type ring, and multiple chiral centres.
- The molecular formula is C₂₆H₄₃N₃O₁₀, a heavy, polar scaffold that can be derived from a complex peptide chain or assembled through multistep organic synthesis.
- Spectroscopic data (¹H/¹³C NMR, MS, IR) confirm the presence of the expected carbonyls, lactone, and amide protons, as well as the stereochemistry at each centre.
- All coupling steps are performed under inert gas and with freshly dried solvents to avoid racemisation.
- The final deprotection step often generates a mixture of diastereomers; this is controlled by the use of a chiral auxiliary or by selective protonation/deprotonation protocols.
- For a direct synthetic analogue (without a linear peptide), the skeleton can be built from a β‑keto‑ester precursor, using intramolecular condensation to close the lactone and install the amide bridges.
- The lactone/ester system mimics the natural ligand of β‑lactamases; assays show a Kᵢ in the low micromolar range for several class A enzymes.
- The amide backbone is compatible with the peptidyl‑glycine‑deamidase family; kinetic analysis reveals a competitive inhibition mechanism (k₍cat₎/Kₘ ≈ 10⁶ M⁻¹ s⁻¹).
- The multiple polar carbonyls allow hydrogen‑bonding with cyclooxygenase‑2 (COX‑2) and lipoxygenase (LOX) active sites, providing an anti‑inflammatory profile.
- The tertiary amine is protonated at physiological pH, conferring a cationic character that promotes interaction with phospholipid bilayers and facilitates uptake by macrophages and T‑cells.
- Conjugation with a fluorescent dye (e.g., FITC) or a chemotherapeutic payload (auristatin) through the terminal ester yields a selective drug‑delivery vector.
- The molecule can also be coupled to an antibody (via a maleimide linkage) to create an antibody‑drug conjugate with a high drug‑to‑antibody ratio (DAR ≈ 4–6).
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