1-Phenyl-5-pyrazolone-3-carboxylic acid (PCP) is primarily used in the synthesis of pharmaceuticals and organic compounds. It serves as a key intermediate in the production of various drugs, particularly those with anti-inflammatory and analgesic properties. PCP is also utilized in the development of dyes and pigments, contributing to the vibrant colors in textiles and other materials. Additionally, its role in organic synthesis extends to the creation of complex molecules for research and industrial applications.