Collect. Czech. Chem. Commun.
1976, 41, 271-284
https://doi.org/10.1135/cccc19760271
Oxidation of 21-oxo-20β,28-epoxy-18α,19βH-ursane derivatives; Unusual reactivity of oxabicyclo[2,2,1]heptane system in ring E
E. Klinotová, J. Beneš, J. Vokoun and A. Vystrčil
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