You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(5S)-9-[(2,3-difluorophenyl)methyl]-2,9-diazaspiro[4.5]decan-2-yl]-(3,4-dimethylphenyl)methanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C24H28F2N2O
assistant