Two new triterpenoid saponins zygophylosides D and E have been isolate
d from Zygophyllum propinquum. Their structures were elucidated as -0-
[beta-D-2-0-sulphonylquinovopyranosyl]-quinovic acid and -O-[beta-D-2-
O-sulphonylquinovopyranosyl]-quinovic acid-28-O-[beta-D-glucopyranosyl
]ester, respectively, by spectral and chemical studies.