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A supramolecular compound(C6H6NO2)3(C6H5NO2)(PW12O40)·2H2O including the Keggin-type[PW12O40]3-polyanion,[HC6H5NO2]+(protonated pyridine-4-carboxylic acid molecule),C6H5NO2(pyridine-4-carboxylic acid molecule)and two free H2O molecules has been synth