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-(4-bromophenyl)cyclopropyl]-N'-ethyl-2-oxa-7-azaspiro[4.4]nonane-7-carboximidamide is given. What is its corresponding molecular formula?
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C19H26BrN3O
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