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The solvation state of biologically active provitamin PP, viz., 3-pyridinecarboxamide, was studied in a water-ethanol solvent by 1H and 13C NMR and IR spectroscopy. The resolvation of the N heteroatom was found to occur at an EtOH content of 0.05–0.25 molar fraction. The degree of conjugation of the carbamide group with the heterocycle changes with an increase in the ethanol concentration. The structures...
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