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 4-[[(2-bromo-6-fluoro-3-methylphenyl)-(1-tert-butyltetrazol-5-yl)methyl]amino]-8-oxa-2-azaspiro[4.5]decan-3-one is given. What is its corresponding molecular formula?
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C21H28BrFN6O2
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