You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-[5'-chloro-5-[2-(3,4-dimethoxyphenyl)ethyl]-2',4,6-trioxospiro[1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrole-3,3'-1H-indole]-1-yl]acetamide into its molecular formula.
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C25H25ClN4O6
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