1H-Pyrido(3,2-b)pyrimido(4,5-e)(1,4)thiazin-2(10H)-one, 4-amino-8-methyl- 1H-Pyrido(3,2-b)pyrimido(4,5-e)(1,4)thiazin-4(10H)-one, 2-amino-8-methyl- 2-Amino-8-methyl-1H-pyrido(3,2-b)pyrimido(4,5-e)(1,4)thiazin-4(10H)-one 63931-12-4