2730133-58-9 | (4S,12aS)-7-Methoxy-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-carboxylic Acid | (4S,12aS)-7-Methoxy-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-carboxylic Acid |