The molecule is an sn-monothiophosphatidylcholine in which the acyl substituents at O-1 and S-2 are both palmitoyl (hexadecanoyl); a chromogenic phospholipase A2 substrate that contains a palmitoyl thioester at the sn-2 position of the glycerol backbone.
2-[[(2R)-3-hexadecanoyloxy-2-hexadecanoylsulfanylpropoxy]-hydroxyphosphoryl]oxyethyl-trimethylazanium