Conclusions
The NMR spectra of 12 cardenolides with oxygen-containing functions at C10 has been studied. The chemical shifts of the signals of the protons of the C18 angular methyl group, a butenolide ring, and some other protons have been discussed as functions of the structural features of the individual compounds.
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Khimiya Prirodnykh Soedinenii, Vol. 5, No. 4, pp. 270–273, 1969
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Sharipov, A.K., Gorovits, M.B., Makarichev, G.K. et al. NMR spectra of cardenolides with an oxygen-containing function at C10 . Chem Nat Compd 5, 228–230 (1969). https://doi.org/10.1007/BF00683839
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DOI: https://doi.org/10.1007/BF00683839