A new triterpenoid saponin and five known ones were isolated from the fruits of Symplocos lucida (Thunb.) Siebold & Zucc. Their structures were determined based on the results of spectroscopy analysis, chemical conversions, and X‐ray crystallographic analyses. The β‐glucuronidase‐inhibitory effects of the isolated and semi‐synthesized triterpenoid saponins were also examined.
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