You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2R)-1-[[(2S)-3-[[(2R)-2-dodecanoyloxy-3-octanoyloxypropoxy]-hydroxyphosphoryl]oxy-2-hydroxypropoxy]-hydroxyphosphoryl]oxy-3-tridecanoyloxypropan-2-yl] 19-methylicosanoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C63H122O17P2
assistant