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 (3R)-N'-[[1-(3-bromophenyl)cyclobutyl]methyl]-N-ethyl-3-hydroxypyrrolidine-1-carboximidamide is given. What is its corresponding molecular formula?
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C18H26BrN3O
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