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One new triterpenoid, 3beta, 16beta, 23, 28-tetrahydroxy oleana-11, 13(18)-dien-3-O-beta-D-glucopyranosyl(1 --> 3) [beta-D-glucopyranosyl(1 --> 2)]-beta-D-fucopyranoside (1), together with two known flavonoids, were isolated from Stellaria media (L.) Cyr. The structure elucidation of the new compound was primarily based on HREIMS, EIMS, UV, IR, 1D- and 2D-NMR analyses, including COSY, HMQC and HMBC correlations.

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Microbial transformation of one oleane‐type pentacyclic triterpene aglycone, phytolaccagenin (2β,3β,23‐trihydroxy‐olean‐12‐ene‐28,30‐dioic acid 30‐methyl ester) by Streptomyces griseus ATCC 13273 was investigated for developing new bioactive derivatives. A new oxidized metabolite, through the regio‐specific hydroxylation on the C‐29 methyl group, was obtained from the preparative‐scale biotransformation with a standard two‐stage fermentation protocol. The metabolite was identified as 2β,3β,23,29‐tetrahydroxy‐olean‐12‐ene‐28,30‐dioic acid 30‐methyl ester by mass and 2D‐NMR spectra.