You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(2-chloro-6-fluorophenyl)-1-[4-(4-methoxybenzoyl)piperidin-1-yl]prop-2-en-1-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H21ClFNO3
assistant