28645-51-4 9-Hexadecenoic acid, 16-hydroxy-, o-lactone EINECS 249-120-7 FEMA No. 2555 Isoambrettolide NSC 31697 Oxacycloheptadec-10-en-2-one omega-6-Hexadecenlactone omega-6-Hexadecenlactone (natural)