2-Amino-4-hydroxy-1,3,8-triazanaphthalene 2-Amino-4-hydroxypyrido(2,3-d)pyrimidine 7255-87-0 NSC 74238 Pyrido(2,3-d)pyrimidin-4(1H)-one, 2-amino- (9CI) Pyrido(2,3-d)pyrimidine, 2-amino-4-hydroxy-