(3aS,8R,8aS,9R,10aS)-9-tert-butyl-8,9-dihydroxydihydro-9H-furo[2,3-b]furo[3',2':2,3]cyclopenta[1,2-c]furan-2,4,7(3H,8H)-trione; (-)-Bilobalide; Bilobalid; (3aS,5aR,8R,8aS,9R,10aS)-9-(1,1-Dimethylethyl)-10,10a-dihydro-8,9-dihydroxy-4H,5aH,9H-furo[2,3-b]furo[3,2':2,3]cyclopenta[1,2-c]furan-2,4,7(3H,8H)-trione
