You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(3-cyano-4,5-dimethylthiophen-2-yl)-2-(3,4-dimethyl-6-oxo-1-phenylpyrazolo[3,4-b]pyridin-7-yl)butanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H25N5O2S
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