1H-carbazole-8-carboxylic acid, 1-formyl-4,9-dihydro-1,9-dihydroxy-4-oxo-, methyl ester 8-Formyl-8,9-dihydroxy-5-oxo-8,9-dihydro-5H-carbazole-1-carboxylic acid methyl ester Coproverdine InChI=1/C15H11NO6/c1-22-14(19)9-4-2-3-8-11-10(18)5-6-15(20,7-17)13(11)16(21)12(8)9/h2-7,20-21H,1H methyl 1-formyl-1,9-dihydroxy-4-oxo-4,9-dihydro-1H-carbazole-8-carboxylate