You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[1-ethyl-4-[4-[3-(methanesulfonamido)phenyl]phenyl]pyrrolidin-3-yl]propane-2-sulfonamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H31N3O4S2
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