You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[2-(aminomethyl)-4-methylpiperidin-1-yl]-3-[3-(trifluoromethyl)phenyl]butan-1-one;hydrochloride is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H26ClF3N2O
assistant