3-(2,5-Dimethylphenyl)-4-(2'-benzimidazolomercaptoacetyl) sydnone, inner salt 4-[2-(1H-Benzoimidazol-2-ylsulfanyl)-acetyl]-3-(2,5-dimethyl-phenyl)-5-hydroxy-[1,2,3]oxadiazol-3-ium, inner salt AIDS-097987 AIDS097987