(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.