57831-76-2 5H-Diimidazo(1,2-a:2',1'-c)(1,4)diazepin-6-ol, 6,7-dihydro-3-nitro- 6,7-Dihydro-3-nitro-5H-diimidazo(1,2-a:2',1'-c)(1,4)diazepin-6-ol BRN 1144510