You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule 8-[1-(4-fluoro-2-methylphenyl)triazole-4-carbonyl]-2-methyl-1-oxa-4,8-diazaspiro[4.5]decan-3-one into molecular formula.
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C18H20FN5O3
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