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4-bromo-5-methylthiophene-2-carboxylic acid; CAS No.: 29421-99-6; 4-Bromo-5-methylthiophene-2-carboxylate serves as a regioselectively substituted thiophene building block. The bromine at C4 and methyl at C5 enable controlled cross-coupling patterns. Through Leading Chemicals Distributor channels, we supply these halogenated thiophenes for organic semiconductor synthesis.