You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 3-[(3R)-3-[[5-(5-methylsulfonylpyridin-2-yl)-1H-pyrrolo[2,3-b]pyridin-4-yl]amino]piperidin-1-yl]-3-oxopropanenitrile into its molecular formula.
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C21H22N6O3S
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