You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[[2-(4-piperazin-1-ylanilino)-7H-pyrrolo[2,3-d]pyrimidin-4-yl]amino]benzenesulfonamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H24N8O2S
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