Definitionen
1.NounThe butenolide (1R,3S,4S,5E,7R,8S)-7-[(2E,4E)-hexa-2,4-dienoyl]-3-hydroxy-8-[(2S)-3-hydroxy-2,4-dimethyl-5-oxofuran-2-yl]-5-[(2E,4E)-1-hydroxyhexa-2,4-dienylidene]-1,3-dimethylbicyclo[2.2.2]octane-2,6-dione related to the bisorbicillinols