1,4-Dihydro-4-oxo-2,5,11-trimethyl-6H-pyrido(3,2-b)carbazole 1,4-Dotpc 1,6-Dihydro-2,5,11-trimethyl-4H-pyrido(3,2-b)carbazol-4-one 111249-53-7 4H-Pyrido(3,2-b)carbazol-4-one, 1,6-dihydro-2,5,11-trimethyl-