The molecule is a phosphatidylcholine 42:0 in which the acyl groups specified at positions 1 and 2 are octadecanoyl and tetracosanoyl respectively. It derives from an octadecanoic acid and a tetracosanoic acid.
[(2R)-3-octadecanoyloxy-2-tetracosanoyloxypropyl] 2-(trimethylazaniumyl)ethyl phosphate