You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 2-fluoro-4-[4-[(1R)-3-isocyanocyclopent-2-en-1-yl]piperazin-1-yl]-N-methylbenzamide .
user
C18H21FN4O
assistant