2 4 diamino 6 chloropyrimidine synthesis July 8, 2019 16 32 64 128 2 4 diamino 6 chloropyrimidine synthesis from barbituric acid 2 4-diamino-6-hydroxypyrimidine 2 4-diamino-6-phenyl-1 3 5-triazine 2 4-diaminopyridine 2 6-diamino-3-((pyridin-3-yl)azo)pyridine