(4R,12aS)-3,4,12,12a-四氢-4-甲基-7-(苯基甲氧基)-2H-吡啶并[1',2':4,5]吡嗪并[2,1-b][1,3]恶嗪-6,8-二酮

(4R,12aS)-3,4,12,12a-Tetrahydro-4-methyl-7-(phenylmethoxy)-2H-pyrido[1',2':4,5]pyrazino[2,1-b][1,3]oxazine-6,8-dione