You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(3,5-dimethylphenyl)-3-[4-(ethylaminomethyl)piperidine-1-carbonyl]pyrrolidin-2-one;hydrochloride The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H32ClN3O2
assistant