2-Methoxy-3-(3-((3-(2-methoxy-4-oxo-5,6,7,8-tetrahydro[1]benzothieno[2,3-d]pyrimidin-3(4H)-yl)propyl)dithio)propyl)-5,6,7,8-tetrahydro[1]benzothieno[2,3-d]pyrimidin-4(3H)-one AIDS-151421 AIDS151421 NSC691799