Two novel triterpenoid saponins belonging to a modified hopane group, spergulin A [3-O-(beta-D-xylopyranosyl 4-sulphate)-spergulagenin A] (1) and spergulin B [3-O-[alpha-rhamnopyranosyl (1-->2)-beta-D-xylopyranosyl]-spergulatriol] (4) were isolated from the aerial part of Mollugo spergula along with spergulacin (2) and spergulacin A (3). Their structures and relative stereochemistry were determined by a combination of 2D-NMR (COSY, TOCSY, HETCOR, NOESY and HMBC) and HR-FAB-MS analysis coupled with strategic chemical and enzymatic transformations.
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| http://dx.doi.org/10.1016/s0031-9422(01)00346-6 | DOI Listing |
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