You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [2-hexadecanoyloxy-3-[[3-[[2-hexadecanoyloxy-3-[(6Z,9Z,12Z,15Z)-octadeca-6,9,12,15-tetraenoyl]oxypropoxy]-hydroxyphosphoryl]oxy-2-hydroxypropoxy]-hydroxyphosphoryl]oxypropyl] (9Z,12Z)-octadeca-9,12-dienoate by IUPAC nomenclature, provide its molecular formula.
user
C77H138O17P2
assistant