You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 3-(3,4,6,7,8,8a-hexahydro-1H-pyrrolo[2,1-c][1,4]oxazin-3-ylmethyl)-1-[(2-bromophenyl)methyl]-1,2-dimethylguanidine;hydroiodide by IUPAC nomenclature, provide its molecular formula.
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C18H28BrIN4O
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