Benzimidazole derivatives, process for the preparation thereof and pharmaceutical composition containing the same

摘要

Novel benzimidazole derivatives of the formula: (I) wherein R1 is an alkyl group having 1 to 3 carbon atoms, allyl group, propargyl group, or phenyl group; R2 is hydrogen atom or an alkyl group having 1 to 3 carbon atoms; and n is 2 or 3, or pharmaceutically acceptable acid addition salts thereof, which have excellent antihistaminic activities and are useful as antiallergics for various allergic diseases, and a process for the preparation thereof, and an antihistaminic composition containing the compound as an active ingredient.