You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (3S,5S)-1-[(2,4-difluorophenyl)methyl]-5-(7-methyl-6,8-dihydro-5H-[1,2,4]triazolo[4,3-a]pyrazin-3-yl)pyrrolidin-3-ol into its molecular formula.
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C17H21F2N5O
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