You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-[(15Z,18Z)-hexacosa-15,18-dienoyl]oxy-3-octanoyloxypropyl] (Z)-octatriacont-27-enoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C75H140O6
assistant