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 tert-butyl 3-[(R)-(4-bromophenyl)-hydroxy-[5-[(Z)-N'-hydroxycarbamimidoyl]pyridin-3-yl]methyl]-3-methylazetidine-1-carboxylate is given. What is its corresponding molecular formula?
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C22H27BrN4O4
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