Eight derivatives(2~9) of hederagenin were synthesized by acetylation,etherification,benzoylation and esterification,et al,on 3,23-hydroxyl and 28-carboxyl of hederagenin.Among them,six derivatives were not reported.The structures were characterized by ~1H NMR,~(13)C NMR,IR and MS.The anti-HBV activities of the compounds were determined by MTT method.The results showed that cell viabilities of 3~9 was significantly inhibited with increasing of concentration.In particular,inhibition ratio of 7 and 9 were 9.4...