Synonyms: Obacunoicacid, 11-hydroxy-, 3,4-lactone, (11b)-; Oxireno[4,4a]-2-benzopyrano[6,5-g][2]benzoxepin-3,5,9(3aaH,4bH,6H)-trione, 1a-(3-furyl)-1,6aa,7,11a,11ba,12,13,13a-octahydro-12b-hydroxy-4bb,7,7,11ab,13aa-pentamethyl- (8CI); 11b-Hydroxyobacunone;Oxireno[4,4a]-2-benzopyrano[6,5-g][2]benzoxepin-3,5,9(3aH,4bH,6H)-trione,1-(3-furanyl)-1,6a,7,11a,11b,12,13,13a-octahydro-12-hydroxy-4b,7,7,11a,13a-pentamethyl-,[1R-(1a,3aa,4aR*,4bb,6aa,11ab,11ba,12b,13aa)]-; Zapoterin