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 (4R,5S)-9-[2-(4-fluorophenoxy)ethyl]-4-methyl-1-oxa-9-azaspiro[5.5]undecane-4,5-diol is given. What is its corresponding molecular formula?
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C18H26FNO4
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