You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule 5-[(4,4-dimethyl-1,2,3,3a,6,6a-hexahydropyrrolo[3,4-c]pyrrol-5-yl)methyl]-1-methyl-2,3-dihydroindole into molecular formula.
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C18H27N3
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