4-(Methylamino)-5,6,7,8-tetrahydro[1]benzothieno[2,3-d]pyrimidin-2-yl hydrosulfide 4-(Methylamino)-5,6,7,8-tetrahydro[1]benzothieno[2,3-d]pyrimidine-2-thiol AIDS-148071 AIDS148071 NSC679230