3-(3-Chloro-4-methylphenyl)-4-(2'-benzimidazolomercaptoacetyl) sydnone, inner salt 4-[2-(1H-Benzoimidazol-2-ylsulfanyl)-acetyl]-3-(3-chloro-4-methyl-phenyl)-5-hydroxy-[1,2,3]oxadiazol-3-ium, inner salt AIDS-097988 AIDS097988