You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (4S)-2-[(5-methylfuran-2-yl)methyl]-4-(pyridin-2-ylmethoxy)-1,3,4,5-tetrahydropyrrolo[1,2-a][1,4]diazepine into molecular formula.
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C20H23N3O2
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