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1-methyl-1H-pyrazole-3-sulfonyl chloride; CAS No.: 89501-90-6; ChemShuttle supplies sulfonyl chlorides like 1-methyl-1H-pyrazole-3-sulfonyl chloride for proteolysis targeting chimera development. As custom synthesis companies, we specialize in reactive intermediates for click chemistry and protein conjugation. The methylpyrazole core provides metabolic stability, while the sulfonyl chloride enables efficient amine acylation. Our expertise includes handling moisture-sensitive reagents under controlled atmosphere conditions.