57831-75-1 5H-Diimidazo(1,2-a:2',1'-c)(1,4)diazepine, 6,7-dihydro-6-chloro-3-nitro- 6,7-Dihydro-6-chloro-3-nitro-5H-diimidazo(1,2-a:2',1'-c)(1,4)diazepine BRN 1144509