5-Bromo-2-chloro-N-cyclopentyl-4-pyrimidinamine733039-20-8100 % similar 3-[2-Chloro-4-(cyclopentylamino)-5-pyrimidinyl]-2-propyn-1-ol1374639-76-555 % similar 2-Chloro-4,5-pyrimidinediamine14631-08-432 % similar