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-(2H-indazol-3-yl)-N-(3,3,3-trifluoro-2-piperazin-1-ylpropyl)acetamide;hydrochloride by IUPAC nomenclature, provide its molecular formula.
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C16H21ClF3N5O
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