5-Pyrimidinemethanamine25198-95-231 % similar 4-Amino-3,5-dibromopyridine84539-34-431 % similar 4,5-Diaminopyrimidine13754-19-330 % similar 4-Isoquinolinamine23687-25-430 % similar 4-Bromopyrimidine31462-56-330 % similar