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 1-[(2S)-2-[2-(6-imidazol-1-ylpyrimidin-4-yl)ethyl]piperidin-1-yl]ethanone is given. What is its corresponding molecular formula?
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C16H21N5O
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