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Candesartan; 1-((2'-(1H-tetrazol-5-yl)biphenyl-4-yl)methyl)-2-ethoxy-1H-benzo[d]imidazole-7-carboxylic acid; CAS No.: 139481-59-7; This carboxylic acid derivative represents ChemShuttle s key intermediates for sartan-class API production. The free acid group enables salt formation (e.g., potassium salts) for final dosage forms. Our crystallization expertise ensures particle size distribution control critical for tablet formulation. The product undergoes rigorous genotoxic impurity testing (<1 ppm), meeting ICH guidelines for commercial drug substances.