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Thiophene-2-sulfonyl chloride (CAS number 16629-19-9) is a chemical intermediate that can be used in the synthesis of various compounds, including pharmaceuticals, agrochemicals, and organic materials. It is not typically used as an API (active pharmaceutical ingredient) in its own right, but rather as a building block or intermediate in the synthesis of other compounds.Thiophene-2-sulfonyl chloride is a versatile intermediate in organic synthesis. It is mainly used in the preparation of various sulfonamides and other sulfur-containing compounds. For example, it can be used to synthesize:Thiophene-2-sulfonamides,Thiophene-2-sulfonic acid.