You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[4-(furan-2-ylmethyl)piperazin-1-yl]-[(4S)-2,3,4,5-tetrahydro-1-benzoxepin-4-yl]methanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H24N2O3
assistant