You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named (1R)-1-(3-chlorophenyl)-2-[[(2R)-1-[4-(3-methyl-1,2,4-oxadiazol-5-yl)anilino]propan-2-yl]amino]ethanol by IUPAC nomenclature, provide its molecular formula.
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C20H23ClN4O2
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