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5-bromo-4-methylthiophene-2-carboxylic acid; CAS No.: 54796-53-1; Specializing in thiophene carboxylates, ChemShuttle provides this brominated derivative for conjugated polymer synthesis. The methyl substituent controls polymer backbone conformation while the bromine enables Stille coupling. Our custom synthesis services include optimization of heterocyclic carboxylation reactions for material science applications.