ethyl 4-methyl-5-propan-2-yloxy-9H-pyrido[5,4-b]indole-3-carboxylate ethyl 5-isopropoxy-4-methyl-9H-pyrido[5,4-b]indole-3-carboxylate 5-isopropoxy-4-methyl-9H-pyrido[5,4-b]indole-3-carboxylic acid ethyl ester 5-isopropoxy-4-methyl-9H-$b-carboline-3-carboxylic acid ethyl ester 89592-45-0 ZK 93 426 NCGC00161396-01 5-Isopropoxy-4-methyl-beta-carboline-3-carboxylic acid ethyl ester 9H-Pyrido(3,4-b)indole-3-carboxylic acid, 4-methyl-5-(1-methylethoxy)-, ethyl ester Ethyl 4-methyl-5-(1-methylethoxy)-9H-pyrido(3,4-b)indole-3-carboxylate ZK93426 ZK 93426