The molecule is a 1,2-diacyl-sn-glycero-3-phosphocholine in which the two acyl substituents at positions 1 and 2 are specified as palmitoyl and butanoyl respectively. It derives from a hexadecanoic acid and a butyric acid.
[(2R)-2-butanoyloxy-3-hexadecanoyloxypropyl] 2-(trimethylazaniumyl)ethyl phosphate