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system
Name the molecular formula for the molecule established as 4-chloro-N-[(1R)-1-[5-[2-(cyclopentylamino)-2-oxoethyl]sulfanyl-4-ethyl-1,2,4-triazol-3-yl]ethyl]benzamide using the IUPAC nomenclature.
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C20H26ClN5O2S
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