2-Ethoxy-3-(2-((2-(2-ethoxy-4-oxo-5,6,7,8-tetrahydro[1]benzothieno[2,3-d]pyrimidin-3(4H)-yl)ethyl)dithio)ethyl)-5,6,7,8-tetrahydro[1]benzothieno[2,3-d]pyrimidin-4(3H)-one AIDS-151982 AIDS151982 NSC694517