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 1-(2-ethoxyphenyl)-3-pentan-3-yl-5,6,7,8-tetrahydro-4H-pyrazolo[3,4-b]azepine is given. What is its corresponding molecular formula?
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C20H29N3O
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