5-Benzyl-4-imino-6-methyl-4,7-dihydro-3H-pyrrolo[2,3-d]pyrimidin-3-amine 5-Benzyl-4-imino-6-methyl-4,7-dihydro-3H-pyrrolo[2,3-d]pyrimidin-3-ylamine AIDS-151225 AIDS151225 NSC690965