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 N-[2-(3,5-dimethylphenoxy)ethyl]-1-(6-methylpyridazin-3-yl)piperidine-3-carboxamide is given. What is its corresponding molecular formula?
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C21H28N4O2
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