6-Benzyl-4-imino-5,6,7,8-tetrahydropyrido[4,3-d]pyrimidin-3(4H)-amine 6-Benzyl-4-imino-5,6,7,8-tetrahydropyrido[4,3-d]pyrimidin-3(4H)-ylamine AIDS-125863 AIDS125863 NSC86868