3-{2-[4-(1,3-Dibutyl-4,6-dioxo-2-thioxo-tetrahydro-pyrimidin-5-ylidene)-but-2-enylidene]-naphtho[2,1-d]thiazol-3-yl}-propane-1-sulfonic acid AIDS-165746 AIDS165746 S-123(*Triethylammonium salt*)