87607-23-6 Carbamic acid, (5-amino-1,2-dihydro-3-(2,3,4-trimethoxyphenyl)pyrido(3,4-b)pyrazin-7-yl)-, ethyl ester Ethyl (5-amino-1,2-dihydro-3-(2,3,4-trimethoxyphenyl)pyrido(3,4-b)pyrazin-7-yl)carbamate