picolinic acid [ 2-pyridine carboxylic acid,2-pyridinecarboxylic acid,calcium dipicolinate trihydrate,chromium picolinate,iron(III) picolinate,picolinate,picolinic acid, hydrochloride,picolinic acid, sodium salt,pyridine-2-carboxylic acid,zinc picolinate ] iron-chelating agent that inhibits DNA synthesis; may interfere with iron-dependent production of stable free organic radical which is essential for ribonucleotide reductase formation of deoxyribonucl