1.0 2026-09-21 12:25:22 UTC 2026-09-21 12:25:52 UTC FDB116422 INDIGO 2-(3-hydroxy-1H-indol-2-yl)indol-3-one C16H10N2O2 InChI=1S/C16H10N2O2/c19-15-9-5-1-3-7-11(9)17-13(15)14-16(20)10-6-2-4-8-12(10)18-14/h1-8,17,19H QQILFGKZUJYXGS-UHFFFAOYSA-N belongs to the class of organic compounds known as hydroxyindoles. These are organic compounds containing an indole moiety that carries a hydroxyl group. Hydroxyindoles Organic compounds Organoheterocyclic compounds Indoles and derivatives Hydroxyindoles Aromatic heteropolycyclic compounds Aryl ketones Azacyclic compounds Benzenoids Heteroaromatic compounds Hydrocarbon derivatives Indoles Ketimines Organic oxides Propargyl-type 1,3-dipolar organic compounds Substituted pyrroles Aromatic heteropolycyclic compound Aryl ketone Azacycle Benzenoid Heteroaromatic compound Hydrocarbon derivative Hydroxyindole Imine Indole Ketimine Ketone Organic 1,3-dipolar compound Organic nitrogen compound Organic oxide Organic oxygen compound Organonitrogen compound Organooxygen compound Propargyl-type 1,3-dipolar organic compound Pyrrole Substituted pyrrole formula C16H10N2O2 ChemAxon inchi InChI=1S/C16H10N2O2/c19-15-9-5-1-3-7-11(9)17-13(15)14-16(20)10-6-2-4-8-12(10)18-14/h1-8,17,19H ChemAxon inchikey QQILFGKZUJYXGS-UHFFFAOYSA-N ChemAxon