Synonyms: Obacunoicacid, 1,2-dihydro-1,11-dihydroxy-, e-lactone, (1a,11b)-;Oxireno[4,4a]-2-benzopyrano[6,5-g][2]benzoxepin, obacunoic acid deriv.;(-)-Clausenarin; 11b-Hydroxydeacetylnomilin; Clausenarin; Oxireno[4,4a]-2-benzopyrano[6,5-g][2]benzoxepin-3,5,9(3aH,4bH,6H)-trione,1-(3-furanyl)decahydro-11,12-dihydroxy-4b,7,7,11a,13a-pentamethyl-, [1S-(1a,3aa,4aS*,4bb,6aa,11b,11ab,11ba,12a,13aa)]-