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 (2E,4E)-2-cyano-5-(5-phenyl-6a,7,8,9,10,10a-hexahydro-6H-phenanthridin-2-yl)penta-2,4-dienoic acid is given. What is its corresponding molecular formula?
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C25H24N2O2
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