Two novel norsesquiterpene peroxides from basidiomycete Steccherinum ochraceum

Two novel 3-nor-methyl-chamigrane sesquiterpene peroxides, named steperoxide A (1) and B (2), have been isolated from basidiomycete Steccherinum ochraceum. This is the first report on the isolation of chamigrane sesquiterpene from higher fungi. The structures of 1 and 2 were established on the basis of spectroscopic data and single-crystal X-ray analysis.