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