20-nor-Isopimarane and isopimarane diterpenoids produced by Aspergillus sp. WT03

Five new uncommon 20- nor -isopimarane diterpenoids featuring a 1,2,3,4-tetrahydronaphthalene and 3,4-dihydronaphthalen-1(2 H )-one moiety and three related known congeners along with one isopimarane diterpenoid were isolated from Aspergillus sp. WT03.