87607-28-1 Carbamic acid, (5-(acetylamino)-1,2-dihydro-3-phenylpyrido(3,4-b)pyrazin-7-yl)-, ethyl ester Ethyl (5-(acetylamino)-1,2-dihydro-3-phenylpyrido(3,4-b)pyrazin-7-yl)carbamate