You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-[(11Z,14Z,17Z)-icosa-11,14,17-trienoyl]oxy-3-[(Z)-tetradec-9-enoyl]oxypropyl] octatriacontanoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C75H138O6
assistant