The paper is dedicated to preferred conformations of mefenamic acid in DMSO. A complex approach based on NME experiments and GIAO quantum chemical calculations was applied to reveal the dominant conformation of the mefenamic acid molecule (2-[(2,3-dimethylphenyl)amino]benzoic acid). Unlike the nuclear Overhauser effect measurements, this method is fast and provides qualitative information on preferred conformations of small molecules in solutions. Obtained results agree well with the X-ray investigation data.

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