You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-fluoro-N-[3-methyl-1-oxo-1-(piperidin-3-ylmethylamino)butan-2-yl]benzamide;hydrochloride The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H27ClFN3O2
assistant