Lichens and Fungi. XVIII. Extractives From Pseudocyphellaria rubella

Abstract

Twenty lupane triterpenoids including five (20RS)- epimeric pairs have been isolated from the chloroform extractives of the lichen Pseudocyphellaria rubella. The utility of g.c.-m.s . procedures in the structural elucidation of the extractives, some of which were complex mixtures is discussed.