(1,1'-Biphenyl)-2,2'-dicarboxylic acid, 4,4'-dinitro- 20246-81-5 4,4'-Dinitro-(1,1'-biphenyl)-2,2'-dicarboxylic acid 4,4'-Dinitro-2,2'-dicarboxybiphenyl 4,4'-Dinitrobiphenyl-2,2'-dicarboxylic acid Diphenic acid, 4,4'-dinitro-