You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 7-(2,4-difluorophenyl)-N-[3-fluoro-4-(2-methylpyridin-4-yl)phenyl]-8-methyl-6,7-dihydropyrimido[5,4-b][1,4]oxazin-2-amine;molecular hydrogen .
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C25H22F3N5O
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