4,4'-[(1-Methylethylidene)bis(1,4-phenyleneoxy)]bisphthalic acid

4,4'-[dimethylmethylenebis(4,1-phenyleneoxy)]bisphthalic acid ; 4,4'-[isopropylidenebis(1,4-phenyleneoxy)]bisphthalic acid ; 4,4'-[(dimethylmethylene)bis(4,1-phenyleneoxy)]bisphthalic acid ; 1,2-benzenedicarboxylicacid, 4,4'-[(1-methylethylidene)bis(4,1-phenyleneoxy)]bis- ; 4,4'-[isopropylidenebis(4,1-phenylene)bisoxy]bisphthalic acid ; 4,4'-[isopropylidenebis[(4,1-phenylene)oxy]]bisphthalic acid ; 4,4'-[(1-methylethylidene)bis(1,4-phenyleneoxy)]bisphthalic acid ; 2,2-bis[4-(3,4-dicarboxyphenoxy)phenyl]propane ; btb 13888 ; 4,4'-[(1-methylethylidene)bis(4,1-phenyleneoxy)]bis(1,2-benzenedicarboxylic acid)