(5-methyl-2-oxo-1,3-dioxol-4-yl)methyl 2-ethoxy-3-[[4-[2-(5-oxo-2H-1,2,4-oxadiazol-3-yl)phenyl]phenyl]methyl]benzimidazole-4-carboxylate 2-ethoxy-3-[[4-[2-(5-oxo-2H-1,2,4-oxadiazol-3-yl)phenyl]phenyl]methyl]-4-benzimidazolecarboxylic acid (5-methyl-2-oxo-1,3-dioxol-4-yl)methyl ester 2-ethoxy-3-[4-[2-(5-keto-2H-1,2,4-oxadiazol-3-yl)phenyl]benzyl]benzimidazole-4-carboxylic acid (2-keto-5-methyl-1,3-dioxol-4-yl)methyl ester