You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule [2-(methylaminomethyl)pyrrolidin-1-yl]-[1-(4-methylphenyl)-4,5,6,7-tetrahydroindazol-3-yl]methanone;hydrochloride into molecular formula.
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C21H29ClN4O
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