1 FQW 2-amino-5-phenethyl-6-phenyl-3h-pyrrolo[2,3-D]pyrimidin-4(7h)-one 1.000 2 DX6 2-amino-5-(2-phenylethyl)-3,7-dihydro-4h-pyrrolo[2,3-D]pyrimidin-4-one 0.760