(4R,12AS)-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-CARBOXYLIC ACID
(4r,12as)-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-carboxylic acid