Metabolic products of Phomopsis oblonga. Part 1. 3a,5a,6,7,8,9,9a,9b-Octahydro-7,9b-dimethylnaphtho[1,2-c]furan-1(3H)-one (oblongolide)

Oblongolide, one of several boring/feeding deterrents for elm bark beetles produced in vitro by the fungus Phomopsis oblonga, is shown by physical methods to be the C14H20O2γ-lactone (3aR,5aS,7R,9aR,9bR)-3a,5a,6,7,8,9,9a,9b-octahydro-7,9b-dimethylnaphtho[l,2-c]furan-1(3H)-one.