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 1-bromo-2-(2-bromo-5-octoxyphenyl)-4-octoxybenzene;3,8-dibromo-3',6'-dioctoxyspiro[benzo[c]chromene-6,9'-fluorene] is given. What is its corresponding molecular formula?
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C69H86Br4O5
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