Summary
1. The structure of norechinocystenolone has been established and it has been shown to be identical with the natural nortriterpene albigenin.
2. The isomerization of isonorechinocytenedione into norechinocystenedione consists in the migration of a double bond from 12–13 position to the 13–18 position.
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Khimiya Prirodnykh Soedinenii, Vol. 3, No. 4, pp. 230–235, 1967
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Belous, V.N. Decarboxylation products of echinocystic acid. Chem Nat Compd 3, 192–195 (1967). https://doi.org/10.1007/BF00564112
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DOI: https://doi.org/10.1007/BF00564112