You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-bromo-2-[4-[4-(2,3-dimethylphenyl)piperazin-1-yl]-4-oxobutyl]isoindole-1,3-dione The above is the IUPAC name of a molecule. Write its molecular formula.
user
C24H26BrN3O3
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