You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(3-fluoro-4-methoxyphenyl)methyl]-3-(4-methylpiperazin-1-yl)pyrrolidine-1-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H27FN4O2
assistant