Abstract Twenty lupane triterpenoids including five (20RS)-epimeric pairs have been isolated from the chloroform extractives of the lichen Pseudocyphellaria rubella. The utility of gc-ms. procedures in the structural elucidation of the extractives, some of which were complex mixtures is discussed.
[Wijeratne, Dharmassree B. T.; Kumar, Vijaya; Sultanbawa, M. Uvais S. Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1981 , p. 2724 - 2726]
