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-[(1R)-1-[3-(3-fluoro-4-methylphenyl)-1,2,4-oxadiazol-5-yl]ethyl]-1,4-dioxa-8-azaspiro[4.5]decane into molecular formula.
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C18H22FN3O3
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