A New Oleanane Triterpenoid Saponin from Dimocarpus longan
摘要
A new oleanane triterpenoid saponin was isolated from the seeds of Dimocarpus longan Lour. The structure of this compound was elucidated as 3-O-β-D-xylopyranosyl-(1→3)-α-L-rhamnopyranosyl-(1→2)-β-D-xylopyranosyloleanolic acid 28-O-β-D-xylopyranosyl-(1→2)-β-D-glucopyranosyl ester (1), named longanoside C. The structure was determined by means of HR-ESI-MS in positive mode and extensive 1D and 2D NMR spectroscopic studies.