You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[carboxy-[3-[(31Z,34Z)-dotetraconta-31,34-dienoyl]oxy-2-[(9Z,12Z,15Z,18Z,21Z)-tetracosa-9,12,15,18,21-pentaenoyl]oxypropoxy]methoxy]ethyl-trimethylazanium by IUPAC nomenclature, provide its molecular formula.
user
C76H136NO8+
assistant