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 N-[7-ethoxy-2-[fluoro-[(3S)-oxolan-3-yl]methyl]imidazo[1,2-a]pyridin-6-yl]-6-(trifluoromethyl)pyridine-2-carboxamide;molecular hydrogen is given. What is its corresponding molecular formula?
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C21H22F4N4O3
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