You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 2-[2,6-dimethyl-4-(5-oxo-4H-1,2,4-oxadiazol-3-yl)phenyl]-N-methyl-N-(5,6,7,8-tetrahydroimidazo[1,2-a]pyridin-6-ylmethyl)acetamide by IUPAC nomenclature, provide its molecular formula.
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C21H25N5O3
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