[1,1'-Biphenyl]-2,2'-dicarboxylic acid2,2'-DICARBOXY DIPHENYL2,2′-联苯二甲酸Biphenyl-2,2′-dicarboxylic acidDiphenic acid联苯基-2,2′-二羧酸2,2'-联苯二甲酸2,2'-Biphenyldicarboxylic aciddiphenic aciddiphenic acid2,2'-bibenzoic acid2,2'-biphenyldicarboxylic acid2,2'-diphenic acidbiphenyl-2,2'-dicarboxylic acid2,2'-dicarboxybiphenyl