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A new oleanane-type triterpenoid saponin, 21 β , 22 α -di- O -angeloyl-15 α , 16 α , 28-trihydroxyolean-12-ene 3 β - O - α -L-rhamnopyranosyl-(1→3)- α -D-xylopyranosyl-(1→3)- β -D-glucopyranoside ( 1 ), together with five known compounds ( 2-5 ), were isolated from  Camellia nitidissima . Their structures were elucidated based on spectroscopic methods, including extensive NMR and MS spectra. Compound  1  showed potential inhibitory activity on α-glucosidase with the IC 50  values of 185.9 ± 44.5 µmol/L.

A new oleanane-type triterpenoid saponin with α-glucosidase inhibitory activity from Camellia nitidissima