AIDS-157989 AIDS157989 Ethyl 6-(4-(hydroxy(oxido)amino)benzylidene)-3-methyl-5-oxo-5,6-dihydro-4lambda~5~-[1,3]thiazolo[2,3-b][1,3]thiazole-2-carboxylate hydrochloride NSC658293 (CHLORIDE SALT)