10H-Pyrido(2,3-b)pyrimido(4,5-e)(1,4)thiazine-2,4-diamine, 7-methoxy- 42362-20-9 7-Methoxy-10H-pyrido(2,3-b)pyrimido(4,5-e)(1,4)thiazine-2,4-diamine NSC 194985