5-HT2A&5-HT2C agonist-3 (compound 4e) is an orally bioavailable and blood-brain barrier penetrant agonist of 5-HT2A and 5-HT2C. 5-HT2A&5-HT2C agonist-3 increases intracellular calcium levels in cells overexpressing 5-HT2A or 5-HT2C receptors, and shows no activity against 5-HT2B receptors. 5-HT2A&5-HT2C agonist-3 can be used for the research of neuropsychiatric disorders.

5-HT2A agonist 8 (Compound 67) is a 5-HT2A agonist, with an EC50 of 4 nM. 5-HT2A agonist 8 can be used in the research of neuropsychiatric and neurodegenerative diseases.

5-Formyl-2-hydroxy-2,4-heptadienedioic acid (compound II) is a product of metu-cleavage of 3,4-dihydroxyphenylacetate.

5-Ethynyl-2'-deoxyuridine-13C2 (EdU-13C2) is the 13C-labeled 5-Ethynyl-2'-deoxyuridine. 5-Ethynyl-2'-deoxyuridine (EdU), a thymidine analogue, is incorporated into cellular DNA during DNA replication and the subsequent reaction of EdU with a fluorescent azide in a “Click” reaction. EdU staining is a fast, sensitive and reproducible method to study cell proliferation. 5-Ethynyl-2'-deoxyuridine is an alkyl chain-based PROTAC linker that can be used in the synthesis of PROTACs. 5-Ethynyl-2'-deoxyuridine is a click chemistry reagent, it contains an Alkyne group and can undergo copper-catalyzed azide-alkyne cycloaddition (CuAAc) with molecules containing Azide groups.

5-Diazomethane quinoxaline is a novel derivatization reagent. 5-Diazomethane quinoxaline is used for the detection of phosphorylated metabolites.

5-CNAC disodium is an orally active enhancer of absorption, with no pharmacological activity on its own. 5-CNAC disodium can significantly enhance the absorption efficiency of the drug (such as Salmon calcitonin) when administered together with it in the gastrointestinal tract. 5-CNAC disodium binds reversibly and non-covalently to peptide drugs, protecting them from degradation by gastrointestinal enzymes, increasing their lipid solubility, promoting passive transcellular absorption, and not damaging the integrity of the intestinal epithelium. 5-CNAC disodium can be used in the research of adjuvants for orally administered peptide agents.

5-Carboxyamino-1-(5-phospho-D-ribosyl)imidazole is a nucleoside metabolite.

5-Amino-2'-deoxyuridine is a thymidine analogue and substrate for chemical reaction. 5-Amino-2'-deoxyuridine can be use in the preparation of labeled probes for DNA microarray analysis.

501A054 is an autophagy activator. 501A054 induces autophagy-dependent cell death via autophagy activation. 501A054 can be used in studies on autophagy regulation such as cervical cancer.

4-PSQ is an orally active neuroprotective agent. 4-PSQ possesses both antioxidant and anti-inflammatory activities. 4-PSQ improves cognitive impairment and depressive- and anxiety-like emotional abnormalities in mice by regulating the activity of Na+, K+-ATPase, the NFκB signaling pathway, and the expression of p21. 4-PSQ can be used for the research of neurological diseases.

4-Nitrophthalic acid is a metal-organic framework (MOF).

4-Methylthio-2-oxobutanoic acid (MTOB) is an ornithine decarboxylase inhibitor. 4-Methylthio-2-oxobutanoic acid reduces ornithine decarboxylase protein levels and enzymatic activity. 4-Methylthio-2-oxobutanoic acid is formed in cells in the Met salvage pathway from methylthioadenosine. 4-Methylthio-2-oxobutanoic acid inhibits cancer cells growth. 4-Methylthio-2-oxobutanoic acid can be used for the research of cancer.

4-Methylbenzyl cyanide is an organic chemical probe used to study intramolecular rotation properties. 4-Methylbenzyl cyanide is promising for research of NMR spectroscopy and physical chemistry research on molecular dynamics.

4-Methyl-3-hydroxyanthranilic acid (MHA) is a key precursor for the synthesis of Actinomycin D.

4-Methoxyphthalic acid is a metal-organic framework (MOF).

4-Hydroxytryptophol is an in vitro metabolite of psilocin, can be found in human liver microsomes and recombinant monoamine oxidase A systems. 4-Hydroxytryptophol is not detected in in vivo samples from mice or humans.

4-Hydroxyphenylacetylglutamic acid is a metabolite of Morus alba L.

4-Hydroxy-L-arginine is a arginine derivative.

4-Hydroxyalprenolol (Alp2b) is a metabolite of β-receptor blocker Alprenolol.

4-Guanidinobutanal is a nucleoside metabolite.

4E,14Z-Sphingadiene is a sphosphingolipid.

4-DMA-3'-OH-Chalcone (compound 24) is a synthetic chalcone derivative and selective cytotoxic agent.4-DMA-3'-OH-Chalcone reduces viability of endometriotic cells, while preserving or enhancing viability of eutopic endometrial cells.4-DMA-3'-OH-Chalcone can be used for the research of endometriosis.

4-Chlorobutyronitrile is a PROTAC linker that can be used in the synthesis of PROTACs.

4-Bromoisophthalic acid (4-Bromo-1,3-benzenedicarboxylic acid) is a metal-organic framework (MOF).

4-Boc-aminomethyl-piperidine is a PROTAC linker that can be used in the synthesis of PROTACs.

447C88 is an acyl-coenzyme A cholesterol acyltransferase (ACAT) inhibitor with an IC50 of 23 nM. 447C88 can reduce plasma cholesterol levels and can be used in the research of endocrine and metabolic diseases such as hyperlipidemia.

4-(2-Boc-aminoethyl)piperidine is a PROTAC linker that can be used in the synthesis of PROTACs.

5-C-phenethyl-DNJ is a selective α-glucosidase GAA inhibitor, with its Ki value for rhGAA being 0.81 μM. 5-C-phenethyl-DNJ exhibits extremely high selectivity for GANAB, GBA1, and GBA2. 5-C-phenethyl-DNJ can be used for the study of Pompe disease.

5-HT2C agonist-13 is an orally active, selective and brain-penetrant 5-HT2C receptor agonist with human 5-HT2C receptor EC50 of 16 nM, Ki of 20 nM. 5-HT2C agonist-13 functionally activates 5-HT2C receptors, reduces food intake, reduces body weight gain, and exhibits effects reversible by a selective 5-HT2C antagonist. 5-HT2C agonist-13 can be used for the research of obesity.

4-Methoxyisophthalic acid (4-Methoxy-1,3-benzenedicarboxylic acid) is a metal-organic framework (MOF).