You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 4'-(3-chlorophenyl)-6-fluoro-6'-(5-fluoro-2-methylphenyl)spiro[1H-indole-3,5'-piperidine]-2,2'-dione .
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C25H19ClF2N2O2
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