3-{2-[4-(1,3-Dibutyl-4,6-dioxo-2-thioxo-tetrahydro-pyrimidin-5-ylidene)-but-2-enylidene]-naphtho[1,2-d]oxazol-1-yl}-propane-1-sulfonic acid AIDS-165762 AIDS165762 S-799(*Triethylammonium salt*)