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KN-93 (2-[N-(2-Hydroxyethyl)]-N-(4-methoxybenzenesulfonyl)]amino-N-(4-chlorocinnamyl)-N-methylbenzylamine), a Calcium/Calmodulin-Dependent Protein Kinase II Inhibitor, Is a Direct Extracellular Blocker of Voltage-Gated Potassium Channels