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system
Name the molecular formula for the molecule established as 3-(4-methoxyphenyl)-1-[(2R)-2-[6-(1,3,4-thiadiazol-2-ylamino)pyridin-2-yl]pyrrolidin-1-yl]propan-1-one using the IUPAC nomenclature.
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C21H23N5O2S
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