2-Amino-4-hydroxy-1,3,8-triazanaphthalene 2-Amino-4-hydroxypyrido[2,3-d]pyrimidine 7255-87-0 NSC74238 Pyrido[2,3-d]pyrimidin-4(1H)-one, 2-amino- Pyrido[2,3-d]pyrimidine, 2-amino-4-hydroxy- WLN: T66 BN DN JNJ CZ EQ