You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-[(7Z,10Z,13Z,16Z,19Z)-docosa-7,10,13,16,19-pentaenoyl]oxy-3-pentadecanoyloxypropyl] hentriacontanoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C71H128O6
assistant