3-{2-[4-(1,3-Dibutyl-4,6-dioxo-2-thioxo-tetrahydro-pyrimidin-5-ylidene)-but-2-enylidene]-4,5-diphenyl-thiazol-3-yl}-propane-1-sulfonic acid AIDS-165751 AIDS165751 S-043(*Triethylammonium salt*)