(4R,12AS)-N-[(2,4-Difluorophenyl)methyl]-3,4,6,8,12,12A-hexahydro-7-methoxy-4-methyl-6,8-dioxo-2H-pyrido[1',2':4,5]pyrazino[2,1-B][1,3]oxazine-9-carboxamide

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