Structures of the lichen depsidones granulatin and chlorogranulatin
Abstract
The lichen depsidones granulatin and chlorogranulatin, isolated from Pseudocyphellaria granulata and P.faveolata, are identified as methyl 4-formyl-3,8-dihydroxy-1,6,9-trimethyl-11-oxo-11H-dibenzo[b,e][1,4]dioxepin-7carboxylate (5a), and methyl 2-chloro-4-formyl-3,8-dihydroxy-1,6,9-trimethyl-11-oxo-11H-dibenzo[b,e][1,4]dioxepin-7-carboxylate (5b), respectively. The latter is a new depsidone metabolite which has hitherto been confused with pannarin (1a).