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-[(9Z,12Z)-hexadeca-9,12-dienoyl]oxypropyl] nonacosanoate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C74H136O6
assistant