AIDS-136359 AIDS136359 NSC637662 {6-[3-(5-Ethoxycarbonylaminocarbonyl-3-methyl-2,6-dioxo-3,6-dihydro-2H-pyrimidin-1-yl)-propoxycarbonylamino]-hexyl}-carbamic acid 3-(5-ethoxycarbonylaminocarbonyl-3-methyl-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-propyl ester