6H-pyrido[4,3-b]carbazole-3-carboxylic acid, 1-(ethylamino)-5,6-dimethyl-, ethyl ester InChI=1/C22H23N3O2/c1-5-23-21-17-11-16-14-9-7-8-10-19(14)25(4)20(16)13(3)15(17)12-18(24-21)22(26)27-6-2/h7-12H,5-6H2,1-4H3,(H,23,24 ethyl 1-(ethylamino)-5,6-dimethyl-6H-pyrido[4,3-b]carbazole-3-carboxylate