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Isonicotinic acid or 4-pyridinecarboxylic acid is an organic compound with the formula C₅H₄N(CO₂H). It is a derivative of pyridine with a carboxylic acid substituent at the 4-position. It is an isomer of picolinic acid and nicotinic acid which have the carboxyl group at the 2- and 3-position respectively compared to the 4-position for nicotinic acid.