You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-[4-(4-methylsulfonylphenyl)piperazin-1-yl]-1-[(3S)-pyrrolidin-3-yl]pyrrolo[2,3-b]pyridine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H27N5O2S
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