You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 2-(5,6-dimethyl-1-benzofuran-3-yl)-1-[4-(5,6,7,8-tetrahydro-[1,2,4]triazolo[4,3-a]pyrazin-3-yl)piperidin-1-yl]ethanone;hydrochloride by IUPAC nomenclature, provide its molecular formula.
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C22H28ClN5O2
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