You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-[1-(3-fluoropyridin-2-yl)pyrrolidin-3-yl]-2-methyl-3-[[2-(trifluoromethoxy)phenyl]methyl]guanidine into its molecular formula.
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C19H21F4N5O
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