The characterization of two novel bufadienolides, lanceotoxins A and B, isolated from Kalanchoe lanceolata is reported. The assignment of the structures is based on a detailed study of their high-field 1H and 13C n.m.r. spectral data and by correlation with known hellebrigenin derivatives.
L. A. P. Anderson, P. S. Steyn and F. R. van Heerden, J. Chem. Soc., Perkin Trans. 1, 1984, 1573 DOI: 10.1039/P19840001573
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