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Recently, we reported the first monoclinic [Kuai & Cheng (2011).  Acta Cryst. , E 67 , o2787] and the ortho­rhom­bic polymorph [Kuai & Cheng (2011).  Acta Cryst. , E 67 , o3014] of the title compound, C 15 H 12 N 2 O 2 . Another monoclinic polymorph was obtained accidentally by the hydro­thermal reaction of the title compound with manganese chloride in the presence of potassium hydroxide at 413 K. The asymmetric unit consists of four independent mol­ecules. In the crystal, O—H⋯N hydrogen bonds link the independent mol­ecules into four separate chains parallel to the  b  axis.

Second monoclinic polymorph of 4-[(1H-benzimidazol-1-yl)methyl]benzoic acid