3-{2-[4-(1,3-Dibutyl-4,6-dioxo-2-thioxo-tetrahydro-pyrimidin-5-ylidene)-but-2-enylidene]-6-phenyl-benzothiazol-3-yl}-propane-1-sulfonic acid AIDS-165754 AIDS165754 S-057(*Triethylammonium salt*)