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Method of producing (4R,12aS)-7,9-dihalo-4-methyl-3,4,12,12a-tetrahydro-2H-pyrido[1′,2′:4,5]pyrazino[2,1-b][1,3]oxazine-6,8-diones

US Patent 9802959 · Granted Oct 31, 2017

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