The molecule is a dicarboxylic acid dianion that results from the removal of a proton from each of the carboxylic acid groups of oxidized dinoflagellate luciferin. It is a conjugate base of an oxidized dinoflagellate luciferin.
(2S,3S,4S,5E)-4-(2-carboxylatoethyl)-5-[2-[[5-[(3-ethenyl-4-methyl-5-oxo-1,2-dihydropyrrol-2-yl)methyl]-3-ethyl-4-methyl-1H-pyrrol-2-yl]methyl]-3-methyl-4,5-dioxo-1H-cyclopenta[b]pyrrol-6-ylidene]-3-methylpyrrolidine-2-carboxylate