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 (5,7-dimethyl-[1,2,4]triazolo[1,5-a]pyrimidin-2-yl)-(2-pyridin-3-ylpiperazin-1-yl)methanone;dihydrochloride is given. What is its corresponding molecular formula?
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C17H21Cl2N7O
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