Clemizole Hydrochloride

The crystal structure of the title compound, 1-[1-(p-chlorobenzyl)-2-(1-pyrrolidinylmethyl)benzimidazolium chloride, C₁₉H₂₁ClN₃⁺.Cl⁻, a potent anti-allergic agent, has been determined. The crystals are composed of independent cations which are hydrogen bonded to chloride ions, with an N...Cl distance of 3.021 (6) Å and an N—H...Cl angle of 173°.

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