You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 2-[(8-methylimidazo[1,2-a]pyridin-2-yl)methoxy]-N-[2-oxo-2-(prop-2-ynylamino)ethyl]benzamide is given. What is its corresponding molecular formula?
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C21H20N4O3
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