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ethyl 2,4-dichloropyrimidine-5-carboxylate Ethyl 4-chloro-2-methylthio-5-pyrimidinecarboxylate Ethyl 2-chloropyrimidine-5-carboxylate 4-Chloropyrimidine ethyl 2-tert-butyl-4-chloropyrimidine-5-carboxylate ETHYL 4-CHLORO-2-METHYLPYRIMIDINE-5-CARBOXYLATE ETHYL 4-CHLORO-2-MORPHOLINOPYRIMIDINE-5-CARBOXYLATE