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Name the molecular formula for the molecule established as 2-[(4R,6S)-1-[chloro(difluoro)methyl]-6-(2-chloro-3-methoxyphenyl)-8-cyano-4,6-dihydro-[1,2,4]triazolo[4,3-a][4,1]benzoxazepin-4-yl]acetic acid using the IUPAC nomenclature.
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C21H14Cl2F2N4O4
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