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system
Name the molecular formula for the molecule established as 2-[[5-(5-chloro-2-methoxyphenyl)-4-prop-2-enyl-1,2,4-triazol-3-yl]sulfanyl]-N-[(4-chlorophenyl)methyl]acetamide using the IUPAC nomenclature.
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C21H20Cl2N4O2S
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