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9-FLUORENONE-2,7-DICARBOXYLIC ACID 3,3',4,4'-Biphenyltetracarboxylic acid 3,3',4,4'-Biphenyltetracarboxylic dianhydride 3'-FORMYL[1,1'-BIPHENYL]-4-CARBOXYLIC ACID 2'-FORMYL-BIPHENYL-4-CARBOXYLIC ACID 4'-ACETYL-BIPHENYL-4-CARBOXYLIC ACID 4'-FORMYLBIPHENYL-4-CARBOXYLIC ACID METHYL ESTER 4'-FORMYL-BIPHENYL-4-CARBOXYLIC ACID ETHYL ESTER