Dolutegravir Sodium Salt

: GSK 1349572A; Dolutegravir sodium; sodium (4R,12aS)-9-(2,4-difluorobenzylcarbamoyl)-4-methyl-6,8-dioxo-3,4,6,8,12,12a-hexahydro-2H-[1,3]oxazino[3,2-a]pyrido[1,2-d]pyrazin-7-olate; N-[(2,4-Difluorophenyl)methyl]-3,4,6,8,12,12a-hexahydro-7-hydroxy-4-methyl-6,8-dioxo-2H-pyrido[1’,2’:4,5]pyrazino[2,1-b][1,3]oxazine-9-carboxamide sodium salt;