In addition to classic chromatography methods, a liquid-liquid chromatography technique, namely centrifugal partition chromatography (CPC) was applied for the purification of compound 2. The structures were determined by analyses of mass spectrometry and 1D and 2D NMR data. Relative configuration of the isolated compounds was assigned on the basis of 2D NOESY experiments. The two compounds possess a rare pentacyclic carbon skeleton specific to lichen metabolism, quite unusual in the vegetal kingdom.

Two new compounds (I) and (II) are isolated, possessing a rare pentacyclic carbon skeleton typical for lichen metabolism, and quite unusual in the vegetal kingdom.