You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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N-benzyl-N-[8-(3,3-dimethyl-2-oxobutoxy)-2-ethylimidazo[1,2-a]pyridin-3-yl]formamide is the IUPAC name of a molecule. Please give its molecular formula.
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C23H27N3O3
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