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Related to picolinic acid: nicotinic acid, pipecolic acid
pic·o·lin·ic acid(pĭk′ə-lĭn′ĭk, pī′kə-)
A carboxylic acid derivative of pyridine, C6H5NO2, that is an isomer of niacin. Biosynthesized from tryptophan, it serves as an important chelating agent to assist in digestive uptake of beneficial trace metals. It is also produced and used industrially in the manufacture of herbicides.