Janthinoid A, an unprecedented tri-nor-meroterpenoid with highly modified bridged 4a,1-(epoxymethano)phenanthrene scaffold, produced by the endophyte of Penicillium janthinellum TE-43

Janthinoid A (1), an unprecedented C 22 meroterpenoid featuring a highly modified bridged 4a,1-(epoxymethano)phenanthrene scaffold, was produced by Penicillium janthinellum .