You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 1-(3-aminopiperidin-1-yl)-3-[3,5-dimethyl-1-[(4-methylphenyl)methyl]pyrazol-4-yl]propan-1-one;hydrochloride .
user
C21H31ClN4O
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