You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 6,6,10',10'-tetramethylspiro[1H-pyrano[2,3-f]indole-2,11'-3,13-diazatetracyclo[5.5.2.01,9.03,7]tetradecane]-2',3,14'-trione is given. What is its corresponding molecular formula?
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C26H29N3O4
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