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 (3Z,10aR)-3-benzylidene-4a-ethyl-7-hydroxy-4,9,10,10a-tetrahydro-1H-phenanthren-2-one is given. What is its corresponding molecular formula?
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C23H24O2
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