You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule N-[(2S)-1-[[(2S)-butan-2-yl]amino]-1-oxo-3-phenylpropan-2-yl]-N-[(3-chlorophenyl)methyl]-4-(3,4-difluoro-N-methylsulfonylanilino)butanamide into molecular formula.
user
C31H36ClF2N3O4S
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