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 2-[(E)-5-(1-hydroxy-3-oxocyclopenta[b]naphthalen-2-yl)pent-2-enylidene]cyclopenta[b]naphthalene-1,3-dione is given. What is its corresponding molecular formula?
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C31H20O4
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