1,3,4,6-Tetrachloro-2,5-diimino-7,8-diphenylglycoluril 102416-24-0 19103-02-7 Imidazo(4,5-d)imidazole, 1,3,4,6-tetrachlorooctahydro-2,5-diimino-3a,6a-diphenyl- Imidazo(4,5-d)imidazole-2,5(1H,3H)-diimine, 1,3,4,6-tetrachlorotetrahydro-3a,6a-diphenyl-