155855-51-9 4,7-Methano-4H-1,3-dioxolo[4,5-d][1,2]oxazine, tetrahydro-2,2-dimethyl-6-(phenylmethyl)-,(3aS,4S,7R,7aS)- 1246616-73-8 (4R,12aS)-7-hydroxy-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 1206102-11-5 (4R,12aS)-N-(2,4-difluorobenzyl)-7-benzylhydroxy-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-carboxamide