7-Methyl-DL-tryptophan is a tryptophan analog.

7-Methylindole is a reagent used in chemical synthesis. It has been used in the synthesis of HIV-1 inhibitors, plant growth inhibitors and antifungal agents.

7-Methylindole-2-carboxylic acid is a reagent used in chemical synthesis. It has been used to synthesize CCK1 receptor antagonists and Xa inhbiitors.

7-Methylindole-3-acetic acid is a reagent used in chemical synthesis. It can be used to synthesize alpha-amino-indole-3-acetic acids that are used as anti-diabetic, anti-obesity and anti-atherosclerotic agents.

7-Nitroindole is a reagent used in chemical synthesis. It has been used in the synthesis of protein kinase and inosine monophosphate inhibitors, beta3 agonists and CCK-1 receptor modulators. 7-Nitroindole has also been used as a photochemical precursor of the 2’-deoxyribonolactone analog.

8-Hydroxyquinoline is an organic compound that is used as a RNA inhibitor, anti-cancer agent and bidentate chelating agent. In vitro studies against Escherichia coli had shown 8-hydroxyquinoline inhibiting RNA polymerase activity. The enzyme’s activity was inhibited by chelating manganese, magnesium or zinc cofactors. Activity of 8-hydroxyquinoline toward RNA polymerase is broad and inhibits the synthesis of vertebrate RNA as well as proteins.

8-Hydroxyquinoline has also been used as an immobile chelating agent to remove transition metals, alkali and alkaline cations from solutions or within organisms. Its capability to bind the positively charged metals has been shown in vivo to inhibit proteasome activity in tumor cells by transporting copper ions into malignant cells. Halting proteasome activity was observed in vitro and in vivo with decreased cancer growth due to apoptosis.

8-Hydroxyquinoline-β-D-galactopyranoside is a chromogenic substrate for β-D-galactosidase, yielding a brown precipitate upon cleavage.

8-Hydroxyquinoline-β-D-glucuronic acid is a substrate for detection of β-D-glucuronidase which yields a brown precipitate upon cleavage and is used for E. coli detection.

8-Methoxypyrene-1,3,6-trisulfonic acid is used as a fluorescent marker or as a fluorescent probe for studying cationic surfactants.