Abstract
A series of new simplified oleanolic acid saponins with a glycosyl ester moiety at C28, were efficiently prepared. Furthermore, the effect of nasal administration of the synthetic oleanolic acid saponins on the nasal anti-influenza virus antibody titer against secondary nasal inoculation of the influenza split vaccine was examined. The result revealed cinnamoyl saponin as a suitable candidate vaccine adjuvant.
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