The molecule is a lysophosphatidylcholine 20:4 in which the acyl group is specified as arachidonoyl and is located at position 2. It derives from an arachidonic acid.
[(2R)-3-hydroxy-2-[(5Z,8Z,11Z,14Z)-icosa-5,8,11,14-tetraenoyl]oxypropyl] 2-(trimethylazaniumyl)ethyl phosphate