You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[2-[(Z)-heptadec-9-enoyl]oxy-3-[(12Z,15Z,18Z,21Z)-tetracosa-12,15,18,21-tetraenoxy]propoxy]-hydroxyphosphoryl]oxyethyl-trimethylazanium is the IUPAC name of a molecule. Please give its molecular formula.
user
C49H91NO7P+
assistant