Hydrochloric Acid → 2-Butyl-1-[(2'-carboxybiphenyl-4-yl)methyl]-4-hydroxymethylimidazole-5-carboxylic acid

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A solution of 0.12 g of 1-[(2'-t-butoxycarbonylbiphenyl-4-yl)methyl]-2-butyl-4-hydroxymethylimidazole-5-carboxylic acid (prepared as described in Example 4) in 2 ml of a 4N solution of hydrogen chloride in dioxane was allowed to stand at room temperature for 5 hours and then the solvent was removed by distillation under reduced pressure. The resulting residue was triturated in ethyl acetate, to give 0.11 g of the title compound in the form of its hydrochloride, melting at 130°-140° C. (with softening).

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