By a combination of spectroscopic and chromatographic procedures it was established that three new triterpenoids isolated from the extractives of the lichen Pseudocyphellaria degelii possessed the novel 3,22-disubstituted 3,4-secostict-4(23)-ene structures (2a), (2e), and (2h) respectively.
E. M. Goh, A. L. Wilkins and P. T. Holland, J. Chem. Soc., Perkin Trans. 1, 1978, 1560 DOI: 10.1039/P19780001560
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