What is the molecular formula of the compound with this IUPAC name 2-[[(Z)-3-[(E)-hexacos-17-enoyl]oxy-2-[[(4E,7E,10E,13E,16E)-nonadeca-4,7,10,13,16-pentaenoyl]amino]octadec-4-enoxy]-hydroxyphosphoryl]oxyethyl-trimethylazanium ?