(5Z,8Z,11Z,14Z)-5,8,11,14-Eicosatetraenoic Acid 2-[[(1,1-Dimethylethoxy)carbonyl]amino]ethyl Ester is an intermediate used in synthesizing O-Arachidonoyl ethanolamine hydrochloride (A765130), a partial agonist at CB1 receptor and a full agonist at CB2 receptor. O-Arachidonoyl ethanolamine hydrochloride can be isolated from constituent of human and rat brain. It can be used to prepare antimicrobial arachidonic acid derivative.