2-Oxetanone, 3-ethyl-4-(8-hydroxy-1,3,5,7,9-pentamethyl-6-oxo-3-undecenyl)-, (3S-(3-alpha,4-beta(1R*,3E,5S*,7R*,8S*,9S*)))- 76808-15-6 Ebelactone B NSC 335651