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 N-methyl-N-(2-oxo-2-piperazin-1-ylethyl)-2-pyridin-3-ylacetamide;hydrochloride is given. What is its corresponding molecular formula?
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C14H21ClN4O2
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