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Molecular structures of NSAIDs flufenamic acid (FFA), tolfenamic acid (TA), mefenamic acid (MA), and other structural analogues illustrating torsion angles (τ1 and τ2 in blue) differing among the forms. In parentheses is the number of structurally characterized polymorphs for each molecule. In some instances the number of polymorphs experimentally observed is greater than the values reported here reflecting additional forms lacking structural characterization.
