130518-25-1 Caribbazoin A Ethyl 1-acetyl-2-(1-(1,3-dihydro-1,3-dioxo-2H-inden-2-ylidene)ethyl)hydrazinecarboxylate Hydrazinecarboxylic acid, 1-acetyl-2-(1-(1,3-dihydro-1,3-dioxo-2H-nden-2-ylidene)ethyl)-, ethyl ester