has role has functional parent herbicide pyridinemonocarboxylic acid synthetic auxin picolinic acid picloram A pyridinemonocarboxylic acid that is pyridine-2-carboxylic acid which is substituted by a chloro group at positions 3,5 and 6, and by an amino group at position 4. It is a systemic herbicide used to control deeply rooted herbaceous weeds and woody plants in rights-of-way, forestry, range lands, pastures, and small grain crops. CHEBI:34922 aminopyridine organochlorine pesticide chloropyridine