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 9-cyclohexa-2,4-dien-1-yl-5-[6-(2H-pyrrol-4-yl)spiro[1,2,4a,8a,9a,10a-hexahydroxanthene-9,9'-4a,6,7,8,8a,9a-hexahydroxanthene]-3'-yl]-1,2,3,4,5,6-hexahydrocarbazole into molecular formula.
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C47H50N2O2
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