5-HT7R antagonist 5 (Compound (R)-4) is a 5-HT7AR antagonist, with a Ki of 46.4 nM. 5-HT7R antagonist 5 shows anticancer effects against prostate cancer.

5-HT7/5-HT2A receptor antagonist 1 is a high-affinity, orally active, brain-penetrant 5-HT7 and 5-HT2A receptor ligand having a pKi = 8.1 at both receptors. 5-HT7/5-HT2A receptor antagonist 1 behaves as an antagonist in an in vitro functional assay for 5-HT2A and as an inverse agonist in an in vitro functional assay for 5-HT7. 5-HT7/5-HT2A receptor antagonist 1 blockade of 5-Carboxamidotryptamine (5-CT) induced hypothermia in rats, and blockade of 2,5-dimethoxy-4-iodoamphetamine (DOI) induced head-twitches in mice. 5-HT7/5-HT2A receptor antagonist 1 occupied 5-HT2A receptor binding sites in the frontal cortex of the rat brain. 5-HT7/5-HT2A receptor antagonist 1 can be used for the study of Neurological diseases.

5-HT6R antagonist 5 (compound 1.2.12(4)) is a potent competitive 5-HT6R antagonist with an IC50 of 4.19 nM. 5-HT6R antagonist 5 can be used for research in various central nervous system (CNS) diseases, cognitive and neurodegenerative diseases.

5-HT2CR agonist 2 (Compound 16k) is a selective, blood-brain barrier-penetrating and Gq-biased 5-HT2CR agonist, with an EC50 of 36 nM. 5-HT2CR agonist 2 attenuates MK801-induced hyperlocomotion and reverses Phencyclidine-induced hyperlocomotor activity.

5-HT2C agonist-12 (example.2) is a selective and orally active 5-HT2C receptor agonist. 5-HT2C agonist-12 can inhibit the accumulation of IP3 with an IC50 of 4.5 nM. 5-HT2C agonist-12 can induce a feeling of fullness, shorten the time of eating, and reduce calorie intake. 5-HT2C agonist-12 can be used for the research of obesity.

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.