1,11-Dihydroxy-12,13-dihydro-5H-indolo(2,3-a)pyrrolo(3,4-c)carbazole-5,7(6H)-dione 133805-03-5 5H-Indolo(2,3-a)pyrrolo(3,4-c)carbazole-5,7(6H)-dione, 12,13-dihydro-1,11-dihydroxy- BE 13793C