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Convenient synthetic strategy toward spinasaponin A methyl ester 1 and calenduloside G methyl ester 2, two natural oleanane-type triterpenoid saponins bearing an unique β-d-glucosyl/galactosyl-(1→3)-β-d-glucuronic acid methyl ester disaccharide moiety, was established. Based on this facile approach, four structurally modified congeners 3–6 with ursolic acid and glycyrrhetinic acid as aglycones were...
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