5-acetyl-4,5,10,10a-tetrahydropyrrolo[3,4-b]carbazole-1,3(2H,3aH)-dione InChI=1/C16H14N2O3/c1-8(19)18-13-5-3-2-4-9(13)10-6-11-12(7-14(10)18)16(21)17-15(11)20/h2-5,11-12H,6-7H2,1H3,(H,17,20,21 pyrrolo[3,4-b]carbazole-1,3(2H,3aH)-dione, 5-acetyl-4,5,10,10a-tetrahydro-