You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named (3R,4R)-1-[[5-[(1R,2S)-2-methylcyclopropyl]furan-2-yl]methyl]-4-[methyl-[(5-methyl-1,3,4-oxadiazol-2-yl)methyl]amino]pyrrolidin-3-ol by IUPAC nomenclature, provide its molecular formula.
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C18H26N4O3
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