4-Chlorophenoxyacetic acid or parachlorophenoxyacetate (pCPA) is a synthetic pesticide similar to chemicals in a group of plant hormones called auxins. A proven use is in the synthesis of Fipexide. References External links Reregistration Eligibility Decision (RED): 4-Chlorophenoxy-acetic Acid (4-CPA), United States Environmental Protection Agency Phenoxyacetic acids Chlorobenzenes Auxinic herbicides NOT WORKING