New Chloro Depsides from the Lichen Lecanora lividocinerea

Abstract

The new depsides 3,5-dichloro-2′-O-methylnorstenosporic acid (4), 5-chloro-2′-O-methylanziaic acid (5) and 3,5-dichloro-2′-O-methylnorhyperlatolic acid (6) have been detected in the lichenLecanora lividocinerea and the structures of these metabolites have been established by unambiguous synthesis. In addition, the synthesis of the depside 3,5-dichloro-4-O-demethylplanaic acid (7) is described.