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 2-[4-[(2S)-2-hydroxy-2-[4-(trifluoromethyl)phenyl]ethyl]-1,4-diazepan-1-yl]benzonitrile is given. What is its corresponding molecular formula?
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C21H22F3N3O
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