You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 4-(2,4-dimethylphenyl)-2-(1-methylsulfonyl-3,6-dihydro-2H-pyridin-4-yl)-1H-pyrrolo[2,3-b]pyridine .
user
C21H23N3O2S
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