You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule N-[3-[(3-bromo-2-methylimidazo[1,2-a]pyridin-8-yl)oxymethyl]-2,4-dichlorophenyl]-2-(ethylcarbamoylamino)-N-methylacetamide into molecular formula.
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C21H22BrCl2N5O3
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