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The two new lidien depsidones methyl-virensate and 5-Cl methyl-virensate were found in the lichens Pseudocyphellaria physciospora and Pseudocyphellaria granulata. Structure elucidation of the new compounds was carried out using UV/VIS-,  1 H-NMR- and El-mass-spectroscopy. In TLC studies 5-Cl methyl-virensate may be confused with pannarin. The close relationship of the two new lidien substances to atranorin and Cl-atranorin is discussed.

zeitschrift für naturforschung c

Methylvirensat und 5-Chlor Methylvirensat aus Arten der Flechtengattung Pseudocypbellaria/ Methyl-virensate and 5-Chloro-methyl-virensate from Species of the Lichen Genus Pseudocyphellaria