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-[(2S)-4,4-difluoro-2-[4-[(4-fluorophenyl)methyl]-1,2,4-triazol-3-yl]pyrrolidin-1-yl]-2-pyridin-3-ylethanone .
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C20H18F3N5O
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