Synonyms: 2,8-Methano-2H-1-benzopyran-5,7(3H,6H)-dione,tetrahydro-8a-hydroxy-6-(hydroxyphenylmethylene)-2-methyl-4a,8-bis(3-methyl-2-butenyl)-3-(3-methyl-3-butenyl)-,(2R,3R,4aR,6E,8S,8aR)- (9CI); 2,8-Methano-2H-1-benzopyran-5,7(3H,6H)-dione,tetrahydro-8a-hydroxy-6-(hydroxyphenylmethylene)-2-methyl-4a,8-bis(3-methyl-2-butenyl)-3-(3-methyl-3-butenyl)-,[2R-(2a,3a,4ab,8a,8ab)]-; (-)-Xerophenone A; Xerophenone A