You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 3-ethyl-3-[4-[4-(3-fluorophenyl)piperazin-1-yl]butyl]-1H-indol-2-one;hydrochloride is given. What is its corresponding molecular formula?
user
C24H31ClFN3O
assistant