You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[[4-(3,4-dichlorophenyl)piperazin-1-yl]methyl]-3,3-dimethylpyrrolidine-2,5-dione The above is the IUPAC name of a molecule. Write its molecular formula.
user
C17H21Cl2N3O2
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