You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (5S)-5-[[[3-(furan-2-yl)-1,2,4-oxadiazol-5-yl]methyl-(pyridin-4-ylmethyl)amino]methyl]pyrrolidin-2-one into its molecular formula.
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C18H19N5O3
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