The structures of compounds X, C20H28O5, and Y, C20H28O3, from Leonotis leonurus have been elucidated. Both possess a labdane skeleton. Compound X is a dilactone containing a cyclic ether linkage and compound Y is an αβ-unsaturated ketone related to marrubiin, with which it has been correlated through a common degradation product.
E. R. Kaplan and D. E. A. Rivett, J. Chem. Soc. C, 1968, 262 DOI: 10.1039/J39680000262
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