In the present study, we for the first time explored the protective effect of LOB (Chrysoeriol 7-O-[β-D-glucuronopyranosyl-(1→2)-O-β-D-glucuronopyranoside]) on myocardial ischemia-reperfusion (I/R) injury in a rat model and on hypoxia-reoxygenation (H/R) injury in a rat myocardium cell line. An I/R