You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2R)-1-[[(2S)-3-[[(2R)-2,3-di(undecanoyloxy)propoxy]-hydroxyphosphoryl]oxy-2-hydroxypropoxy]-hydroxyphosphoryl]oxy-3-(12-methyltetradecanoyloxy)propan-2-yl] 22-methyltetracosanoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C71H138O17P2
assistant