3-{2-[4-(1,3-Dibutyl-4,6-dioxo-2-selenoxo-tetrahydro-pyrimidin-5-ylidene)-but-2-enylidene]-naphtho[2,1-d]thiazol-3-yl}-propane-1-sulfonic acid AIDS-165776 AIDS165776 Se-123(*Triethylammonium salt*)