Four new B orcinol meta-depsides from Pertusaria and Siphula lichens

Abstract

The new depsides decarboxyhypothamnolic acid [3-(2′,4′-dihydroxy-3′,6′-dimethylphenyloxycarbonyl)-2- hydroxy-6-methoxy-4-methylbenzoic acid] (4) and cryptothamnolic acid [3-(3′-formyl-2′-hydroxy-4′-methoxy6′-methylbenzoyloxy)- 4,6-dihydrox