You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[7-[[2-fluoro-4-[(spiro[3.3]heptan-2-ylamino)methyl]phenyl]methylsulfanyl]-3-oxo-1H-isoindol-2-yl]pentanedial is the IUPAC name of a molecule. Please give its molecular formula.
user
C28H31FN2O3S
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