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-(2-hydroxyethyl)-N-(2,3,4,5-tetrahydro-1-benzoxepin-5-yl)piperidine-1-carboxamide is given. What is its corresponding molecular formula?
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C18H26N2O3
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