You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3R,4S)-N-(3,5-dimethylphenyl)-N-methyl-4-(1-methylpyrazol-4-yl)pyrrolidine-3-carboxamide;hydrochloride is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H25ClN4O
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