1 65O 5-methyl-6-(naphthalen-1-ylsulfanyl)thieno[2,3-D]pyrimidine-2,4-diamine 1.000 2 63Y 5-methyl-6-[(2,3,4-trifluorophenyl)sulfanyl]thieno[2,3-D]pyrimidine-2,4-diamine 0.731 3 63W 5-methyl-6-{[4-(trifluoromethyl)phenyl]sulfanyl}thieno[2,3-D]pyrimidine-2,4-diamine 0.704