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).

41-O-Demethylrapamycin is a metabolite of Rapamycin produced by Bacillus megaterium.

3α,7α-Dihydroxycoprostane is a metabolite of cholest-4-en-3-one-7α-ol.

4-Demethoxy-7,9-di-epi-daunorubicin, a derivative of Daunorubicin, is an anthracycline antibiotics. 4-Demethoxy-7,9-di-epi-daunorubicin can bind to calf thymus DNA and forms a complex with the stacked DNA base pairs. 4-Demethoxy-7,9-di-epi-daunorubicin can inhibit prokaryotic nucleic acid polymerases, including E. coli DNA polymerase I and RNA polymerase. 4-Demethoxy-7,9-di-epi-daunorubicin can be used for researches of cancer and infection.

3α,7α-Dihydroxy-5β-cholestan-26-al is a nucleoside metabolite.

3tBu-Crown TFA is a chelator. 3tBu-Crown TFA chelates radiometals and couples to biological targeting moieties to facilitate targeted delivery of chelated radiometals.3tBu-Crown TFA can be used for the research of cancer.

3-Phospho-D-glycerate can be converted to 2-phospho-d-glycerate (2-PGA) via phosphoglycerate mutase.

3'-O-(2-Nitrobenzyl)-dCTP is a reversible terminator. 3'-O-(2-Nitrobenzyl)-dCTP can be recognized and incorporated by polymerases, thereby temporarily terminating primer extension during DNA synthesis. After incorporation into the extending DNA strand, 3'-O-(2-Nitrobenzyl)-dCTP temporarily halts the DNA polymerase extension reaction, and its 3'-O-(2-nitrobenzyl) blocking group can be removed by laser irradiation to regenerate a free 3'-OH for subsequent primer extension cycles. 3'-O-(2-Nitrobenzyl)-dCTP is applicable for resolving homopolymeric regions in DNA templates.

3-Methylcathinone (3-MMC) hydrochloride is an analogue of a psychoactive substance.

3'-Methoxy-4'-nitroflavone (MNF) is a specific aryl hydrocarbon receptor (AhR) antagonist. 3'-Methoxy-4'-nitroflavone activates AhR by inhibiting CYP1, the metabolic enzyme of the endogenous ligand FICZ, leading to the accumulation of FICZ. 3'-Methoxy-4'-nitroflavone reverses the anti-apoptotic effect of TCDD, attenuates the activation of Akt and Erk1/2 kinases and the expression of TGFα induced by TCDD. 3'-Methoxy-4'-nitroflavone can be used in research related to breast tumor promotion, rheumatoid arthritis, multiple sclerosis and inflammatory bowel disease.