You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 4-[3-(3,4-dimethylphenyl)-4-(3-methylpiperidin-1-yl)-2,5-dioxopyrrol-1-yl]benzonitrile into molecular formula.
user
C25H25N3O2
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