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 (7S)-5-[3-chloro-4-(trifluoromethyl)phenyl]-7-methyl-N-(2-methylpyridin-4-yl)-4-oxo-6,7-dihydropyrazolo[1,5-a]pyrazine-3-carboxamide .
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C21H17ClF3N5O2
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