The molecule is a 1-octadecanoyl-2-octadecenoyl-sn-glycero-3-phosphocholine in which the acyl groups specified at positions 1 and 2 are octadecanoyl and (11Z)-octadecenoyl respectively. It derives from a cis-vaccenic acid.
[(2R)-3-octadecanoyloxy-2-[(Z)-octadec-11-enoyl]oxypropyl] 2-(trimethylazaniumyl)ethyl phosphate