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Studies on the roots of Cynanchum stauntoi led to the isolation of two C 21 -steroidal glycosides, formally named stauntosides A and B. Their structures were elucidated on the basis of spectroscopic evidence, especially that from analysis of 2D-NMR spectra. They were found to possess an unusual skeleton and were identified as stauntogenin 3-O-α-L-diginopyranosyl-(1-4)-β-L-cymaropyranosyl-(1-4)-β-D-digitoxopyran...
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