You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(1S)-1-[4-[2-(2,4-dichlorophenyl)sulfonyl-4-methoxyphenyl]sulfonylphenyl]ethyl]methanesulfonamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H21Cl2NO7S3
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