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5-bromo-2-methylbenzene-1-sulfonyl chloride; CAS No.: 69321-56-8; 5-Bromo-2-methylbenzene-1-sulfonyl chloride serves as a sulfonating agent for peptide modification. Our chemical online mall offers this sulfonyl chloride with amine reactivity profiles, supporting site-specific protein conjugation in biopharmaceutical research.