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The structure of spirosupinanonediol, a new triterpenoid isolated from Euphorbia supina Rafin., has been established by spectral and X-ray analysis as 7(8→9)abeo-9S-D : C-friedo-B′ : A′-neogammaceran-8-one-3S,7S-diol, with a novel skeletal system for which the name spirosupinane is proposed.
S. Matsunaga, R. Morita, T. Ishida, M. Inoue, M. Shigi and A. Miyamae, J. Chem. Soc., Chem. Commun., 1984, 1128 DOI: 10.1039/C39840001128
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