30768-50-4 7-Ethyl methyl 5-amino-3-((p-carboxy-N-methylanilino)methyl)-1,2-dihydropyrido(3,4-b)pyrazine-7-carbamate Pyrido(3,4-b)pyrazine-7-carbamic acid, 5-amino-3-((p-carboxy-N-methylanilino)methyl)-1,2-dihydro-, 7-ethyl methyl ester