You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule [1-carboxy-3-[3-[(8E,11E,14E)-heptadeca-8,11,14-trienoyl]oxy-2-hexadecanoyloxypropoxy]propyl]-trimethylazanium .
user
C43H78NO7+
assistant