1 4ES 4-(2-chloro-4-nitrophenyl)-6-methylpyrimidin-2-amine 1.000 2 F3E 4-phenylpyrimidin-2-amine 0.722 3 3RP 4-(2,4-dichloro-5-methoxyphenyl)-6-methylpyrimidin-2-amine 0.714