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system
Name the molecular formula for the molecule established as ethyl 2-[1-[(5,7-dichloro-1,3-benzothiazol-2-yl)methyl]-6-methyl-2-oxo-3,4-dihydroquinolin-3-yl]acetate using the IUPAC nomenclature.
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C22H20Cl2N2O3S
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