You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(2-chloro-4-fluorophenyl)methyl]-N-[[4-(3-methylsulfonylphenyl)phenyl]methyl]benzenesulfonamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C27H23ClFNO4S2
assistant