Phytochemistry p. 1539 - 1542 (1993)
Update date:2022-08-28
Topics:
Tian, Jun
Wu, Feng-E
Qiu, Ming-Hua
Nie, Rui-Lin
Two new triterpenoid saponins, named bretschnosides A and B, were isolated from the roots of Pterocephalus bretschneidri.On the basis of chemical degradation and spectroscopic evidence, the structures of bretschnosides A and B were shown to be 3-O-α-L-rhamnopyranosyl(1->3)-β-D-xylopyranosyl(1->3)-α-L-rhamnopyranosyl(1->2)-β-D-xylopyranosyl oleanolic acid 28-O-β-D-glucopyranosyl(1->6)-β-D-glucopyranoside 4 and 3-O-α-D-glucopyranosyl(1->3)-β-D-xylopyranosyl(1->3)-α-L-rhamnopyranosyl(1->2)-β-D-xylopyranosyl oleanolic acid 28-O-β-D-glucopyranosyl(1->6)-β-D-glucopyranoside 6, respectively.Key Word Index: Pterocephalus bretschneidri; Dipsacaceae; roots; triterpenoid saponins; bretschnoside A and B.
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