Write an article about the Applications of (4R,12aS)-N-(2,4-difluorobenzyl)-7-benzylhydroxy-4-Methyl-6,8-dioxo-3,4,6,8,12,12a-hexahydro-2H-pyrido[1',2':4,5]pyrazino[2,1-b][1,3]oxazine-9-carboxaMide 2000 words in chemical industry Respond with more than 600 words.
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