Different extracts of Rhodobryum giganteum Par. were screened with mice model of acute myocardial hypoxia induced by isoproterenol and pituitrin, eight compounds, i.e. p-hydroxycinnamic acid, caffeic acid-4-O-β-d-glucopyranoside, salicin, 7,8-dihydroxy coumarin, menthol, allantoin, palmitic acid,