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Name the molecular formula for the molecule established as N-(3-chlorophenyl)-2-[3-[(7R)-5-oxo-6,7-dihydro-4H-[1,2,4]triazolo[1,5-a]pyrimidin-7-yl]phenoxy]acetamide using the IUPAC nomenclature.
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C19H16ClN5O3
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