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)-1-[2-[(2E)-penta-2,4-dien-2-yl]phenyl]prop-1-en-2-yl]benzaldehyde is given. What is its corresponding molecular formula?
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C21H20O
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