You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [3-nonanoyloxy-2-[(12Z,15Z,18Z,21Z)-tetracosa-12,15,18,21-tetraenoyl]oxypropyl] (27Z,30Z)-octatriaconta-27,30-dienoate by IUPAC nomenclature, provide its molecular formula.
user
C74H132O6
assistant