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Translate the chemical IUPAC name 1-[2,3-dimethyl-3-(4'-methylidene-2,5'-dioxospiro[indole-3,2'-pyrrolidine]-1-yl)butan-2-yl]-3'-methylidenespiro[indole-3,5'-pyrrolidine]-2,2'-dione into its molecular formula.
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C30H30N4O4
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