Bi-linderone, a highly modified methyl-linderone dimer from Lindera aggregata with activity toward improvement of insulin sensitivity in vitro

Bi-linderone (1) was isolated as racemate from the traditional Chinese medicinal plant Lindera aggregata. The structure elucidation of bi-linderone was reported on the basis of extensive analysis of NMR spectra and crystal X-ray diffraction. Bi-linderone has an unprecedented spirocyclopentenedione-containing carbon skeleton and showed significant activity against glucosamine-induced Insulin resistance in HepG2 cells at a concentration of 1 microg/mL.