You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-[[4-[5-(methylamino)-3-(trifluoromethyl)-4,5,6,7-tetrahydroindazol-1-yl]phenyl]methyl]pyrrolidin-2-one into its molecular formula.
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C20H23F3N4O
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