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 4-[3-[(3-chlorophenyl)methoxy]phenyl]-6-methyl-2-oxo-1H-pyridine-3-carbonitrile is given. What is its corresponding molecular formula?
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C20H15ClN2O2
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