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methyl 5-chloro-4-nitrothiophene-2-carboxylate; CAS No.: 57800-76-7; As a chemical online mall, ChemShuttle offers nitrothiophene esters for photosensitizer development. The 5-chloro-4-nitro substitution enables efficient light absorption. Our regioselective nitration protocol minimizes isomer formation. This product supports creation of Type II photodynamic therapy agents through controlled singlet oxygen generation.