1-(6-Iodo-7-methyl-2,3-dihydro-1H-pyrido[2,3-b]-[1,4]oxazin-1-yl)-2,2-dimethylpropan-1-one1-(6-Iodo-7-methyl-2,3-dihydro-1H-pyrido[2,3-b][1,4]oxazin-1-yl)-2,2-dimethylpropan-1-one1-(6-Iodo-7-methyl-2,3-dihydro-1H-pyrido[2,3-b][1,4]oxazin-1-yl)-2,2-dimethylpropan-1-one