You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (3R,4S)-4-(4-fluorophenyl)-1-(4-methoxyphenyl)sulfonyl-N-(2-methylpropyl)pyrrolidine-3-carboxamide into molecular formula.
user
C22H27FN2O4S
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