The two major aglycones (I) and (II) from the tumour inhibitory saponins of Acer negundo are shown to be diesters of a new triterpene; each aglycone yields acetic acid and a unique nonadienoic acid upon hydrolysis.
S. M. Kupchan, M. Takasugi, R. M. Smith and P. S. Steyn, J. Chem. Soc. D, 1970, 969 DOI: 10.1039/C29700000969
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