You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
10'-(4-methylphenyl)spiro[1H-indole-3,9'-2,3,4,5,6,7-hexahydroacridine]-1',2,8'-trione The above is the IUPAC name of a molecule. Write its molecular formula.
user
C27H24N2O3
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