2-[[2-[(7Z,10Z,13Z,16Z,19Z)-docosa-7,10,13,16,19-pentaenoyl]oxy-3-[(10Z,13Z,16Z,19Z,22Z,25Z)-octacosa-10,13,16,19,22,25-hexaenoxy]propoxy]-hydroxyphosphoryl]oxyethyl-trimethylazanium