The present invention relates, in various embodiments, to a compound represented by Structural Formula (I), pharmaceutically acceptable salts or prodrugs thereof, and compositions comprising said compounds, or pharmaceutically acceptable salts or prodrugs thereof. Methods of using compounds of Structural Formulas (I) and (Ia) or compositions comprising compounds of Structural Formulas (I) and (Ia), or pharmaceutically acceptable salts or prodrugs thereof, to treat ischemia or ischemia-reperfusion injury are also disclosed.