3-(4-Bromophenyl)-4-(2'-benzimidazolomercaptoacetyl) sydnone, inner salt 4-[2-(1H-Benzoimidazol-2-ylsulfanyl)-acetyl]-3-(4-bromo-phenyl)-5-hydroxy-[1,2,3]oxadiazol-3-ium, inner salt AIDS-097985 AIDS097985