2,4-Diamino-5-methyl-6-(but-2-yl)pyrido(2,3-d)pyrimidine 2,4-Diamino-5-methyl-6-s-butyl-pyrido(2,3-d)pyrimidine 2,4-Diamino-5-methyl-6-sec-butylpyrido(2,3-d)pyrimidine 7319-47-3 BRN 0614824 BW 283U BW 58-283 BW 58-283b Pyrido(2,3-d)pyrimidine, 2,4-diamino-6-sec-butyl-5-methyl- Pyrido(2,3-d)pyrimidine-2,4-diamine, 5-methyl-6-(1-methylpropyl)- (9CI)