Sodium-hydrogen exchanger isoform 1 (NHE1) inhibitor that displays selectivity over other NHE isoforms (Ki values are 14, 2200 and 220000 nM for human NHE1, human NHE2 and rat NHE3 respectively). Inhibits NHE1 dependent 22Na+ uptake in vitro (IC50 = 14 nM) and provides cardioprotection from myocardial ischemic injury in vivo (EC50 = 0.25 nM). Also inhibits MMP2/9 activity and invasion in breast cancer cells. Purity 99%. MW (observed): 393.27