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Fourteen triterpenes, lup-20(29)-ene-3β,6β-diol (1), betulin (2), lupeol caffeate (3), 3β-caffeoyloxylup-20(29)-en-6α-ol (4), betulin-3β-yl-caffeate (5), 3β-trans-feruloylbetulin (6), betulinaldehyde 3-caffeate (7), 3-O-trans-caffeoylbetulinic acid (8), dammarenediol II 3-caffeate (9), 12-oleanene-3β,6α-diol (1, 11α-hydroxy-3β-amyrin (11), nivadiol (12), 29-hydroxyfriedelin (13), and celastrusin A (14) were isolated from Celastrus orbiculatus Thunb. and evaluated for their activity on receptor activator of nuclear factor κB ligand (RAN