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 3-[[(3R,5S)-7-[(3-methylimidazol-4-yl)methyl]-1-oxa-7-azaspiro[4.4]nonan-3-yl]amino]benzonitrile is given. What is its corresponding molecular formula?
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C19H23N5O
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