142383-42-4 A 83016A A-83016A A83016A Propanoic acid, 2-methyl-, 1-(acetyloxy)-5-cyano-2,3,4,5,6,11-hexahydro-3,7-dihydroxy-3-methyl-6,11-dioxo-1H-benzo(b)carbazole-2,4-diyl ester, (1S-(1alpha,2beta,3alpha,4alpha))-