Royalchem supplies 3,5-Dichlorobenzoic Acid (CAS 51-36-5), a chlorinated aromatic carboxylic acid building block. Reference specification: HPLC purity ≥99.0%, moisture ≤0.5% and single impurity ≤0.5%, with a white powder appearance. Published patents describe its use in tafamidis synthesis. For chemical synthesis and R&D; supply is confirmed against the agreed specification and corresponding batch COA.