A New Bidesmoside Saponin from the Bark of Guaiacum officinale

A new bidesmosidic triterpene saponin, guaianin P was isolated from the stem bark of
Guaiacum officinale. Its structure was established as oleanolic acid 3-O-{α-L-rhamnopyranosyl-
(1→3)-α-L-rhamnopyranosyl-(1→2)-[β-D-glucopyranosyl-(1→3)]-α-L-arabinopyranoside}-28-O-
β-D-glucopyranosyl ester by spectroscopic and chemical

http://jcsp.org.pk/index.php/jcsp/article/viewFile/4177/2961  is the link
J. Chem.Soc.Pak., Vol. 34, No. 2, 2012 BY
NIKHAT SABA et al.,
RASHEEDA KHATOON, ZULFIQAR ALI and VIQAR UDDIN AHMAD
KARACHI
Guaianin P  is very nicely described
https://docs.google.com/viewer?url=http%3A%2F%2Fprr.hec.gov.pk%2FChapters%2F612-0.pdf
Above link gives the structures


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