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3-methylthiophene-2-carboxylic acid; CAS No.: 23806-24-8; This methylthiophene carboxylic acid (3-methylthiophene-2-carboxylic acid) from ChemShuttle facilitates regioselective electrophilic substitutions. The methyl group directs incoming electrophiles to the 5-position, enabling predictable derivatization. Process chemistry support includes optimization for minimal di-substitution byproducts.