4-aminobenzoic acid

4-Aminobenzoic acid (CAS 150-13-0), commonly known as PABA or para-aminobenzoic acid, is an aromatic amino acid derivative used as a key building block in pharmaceutical synthesis.

Where is 4-aminobenzoic acid used?

• Pharmaceuticals: precursor in the synthesis of local anesthetics such as benzocaine and procaine, as well as folate-class compounds
• Textile and leather: intermediate in azo dye production for colorfast, high-affinity dye systems
• Personal care: UV-B absorbing agents in sunscreen formulations
• Specialty polymers and coatings: crosslinking and surface-modifying agent
• Its bifunctional structure, carrying both an amine and a carboxylic acid group, makes it a reactive intermediate for producing dyes, UV absorbers, and active pharmaceutical ingredients.

Good to know: Demand has shifted toward its ester forms in recent years.

Commercial specifications

• Bulk quantities for industrial synthesis; smaller quantities for R&D use