3(2H)-Benzothiazolebutanesulfonic acid, 2-[(2E)-4-(1,3-dibutyltetrahydro-4,6-dioxo-2-thioxo-5(2H)-pyrimidinylidene)-2-butenylidene]-, (2E)- AIDS-165735 AIDS165735 S-066(*Triethylammonium salt*)