1,3,4,6-Tetrachlorglycoluril 1,3,4,6-Tetrachloroglycoluril 776-19-2 Chlorinated glycoluril Glycoluril, 1,3,4,6-tetrachloro- Imidazo[4,5-d]imidazole-2,5(1H,3H)-dione, 1,3,4,6-tetrachlorotetrahydro- NSC100721 Tetrachloroglycoluril