You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 1'-(2,2-dimethylpropanoyl)-2'-(furan-2-carbonyl)-5'-methylspiro[1H-indole-3,3'-2,3a-dihydro-1H-pyrrolo[1,2-a]quinoline]-2-one into molecular formula.
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C30H28N2O4
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