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Reference.org
Sematilide
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<p>Sematilide is an <a href="/facts/Antiarrhythmic_agent/RJPHtxKr">antiarrhythmic agent</a>. It is the same structure as for <a href="/facts/Procainamide/dXCPX6yU">procainamide</a>, differing only by the placement of a mesyl sulfonamide moiety to the anilino nitrogen. </p>