Ca2+ overload in myocardial cells is responsible for arrhythmia. Sodium–calcium exchanger (NCX) inhibitors are more effective than sodium–hydrogen exchanger (NHE) inhibitors with regard to modulation of Ca2+ overload, because NCX inhibitors can directly inhibit the influx of Ca2+ into cells. NCX is an attractive target for the treatment of heart failure and ischemia- reperfusion. We have designed and synthesized a series of N-(2-aminopyridin-4-ylmethyl) ...