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-[(1S)-1-[4-[[(2S)-3,4-dihydro-2H-pyran-2-yl]methyl]piperazin-1-yl]ethyl]benzonitrile is given. What is its corresponding molecular formula?
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C19H25N3O
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