You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3'-(3-bromophenyl)-6-chloro-5'-(2,2-dimethylpropyl)-2-oxospiro[1H-indole-3,4'-pyrrolidine]-2'-carboxylic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H24BrClN2O3
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