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-[4-(oxan-4-ylmethylcarbamoyl)phenyl]-6,8-dihydro-5H-imidazo[1,2-a]pyrazine-7-carboxamide into molecular formula.
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C20H25N5O3
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