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  • Title: Two triterpenoid saponins from Pterocephalus bretschneidri.
    Author: Tian J, Wu FE, Qiu MH, Nie RL.
    Journal: Phytochemistry; 1993 Apr; 32(6):1539-42. PubMed ID: 7763556.
    Abstract:
    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-alpha-L-rhamnopyranosyl(1-->3)- beta-D-xylopyranosyl(1-->3)-alpha-L-rhamnopyranosyl(1-->2)-beta-D- xylopyranosyl oleanolic acid 28-O-beta-D-glucopyranosyl(1-->6)-beta-D-glucopyranoside 4 and 3-O-alpha-D-glucopyranosyl(1-->3)-beta-D-xylopyranosyl(1-->3)-alpha-L- rhamnopyranosyl(1-->2)-beta-D-xylopyranosyl oleanolic acid 28-O-beta-D-glucopyranosyl(1-->6)-beta-D-glucopyranoside 6, respectively.
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