4-Amino-2-chloro-5-methylpyrimidine14394-70-831 % similar 2-Chloro-4-methylpyrimidin-5-amine20090-69-131 % similar 4-Amino-5-bromo-2-chloropyrimidine205672-25-931 % similar 7-Deazahypoxanthine3680-71-531 % similar 2-Chloro-5-iodopyrimidin-4-amine597551-56-931 % similar 5-Bromo-2-chloro-4-methylpyrimidine633328-95-731 % similar