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XB-ART-8154
J Med Chem 2001 Nov 08;4423:3764-7. doi: 10.1021/jm015505u.
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Design and synthesis of 4-substituted benzamides as potent, selective, and orally bioavailable I(Ks) blockers.

Lloyd J , Schmidt JB , Rovnyak G , Ahmad S , Atwal KS , Bisaha SN , Doweyko LM , Stein PD , Traeger SC , Mathur A , Conder ML , DiMarco J , Harper TW , Jenkins-West T , Levesque PC , Normandin DE , Russell AD , Serafino RP , Smith MA , Lodge NJ .


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Multiple delayed rectifier potassium currents, including I(Ks), are responsible for the repolarization and termination of the cardiac action potential, and blockers of these currents may be useful as antiarrhythmic agents. Modification of compound 5 produced 19(S) that is the most potent I(Ks) blocker reported to date with >5000-fold selectivity over other cardiac ion channels. Further modification produced 24A with 23% oral bioavailability.

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