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 8-[7,7-difluoro-2-[(2S,3R)-3-hydroxy-2-methylazetidin-1-yl]-5,6-dihydrocyclopenta[d]pyrimidin-4-yl]-2,2-difluoro-3,4-dihydro-1,4-benzoxazepin-5-one .
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C20H18F4N4O3
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