The title compound, C21H23BrN4O8, is a glycoluril derivative in which the oxadiazinane six-membered ring displays a normal chair conformation. The meth-oxy and Br groups attached to the phenyl ring are disordered in a 0.847 (4):0.153 (4) ratio and the pendant eth-oxy group is disordered over two positions in a 0.531 (14):0.469 (14) ratio. Inter-molecular C - H⋯O inter-actions may be effective in the stabilization of the crystal structure...
