[4,4'-Biphenyldiylbis(methylene)]bis(phosphonic acid)

4,4'-联苯基二甲醛

4,4'-二羟甲基联苯

4,4'-双(二乙氧基膦酰甲基)联苯

2-[4-[4-(carboxymethyl)phenyl]phenyl]acetic acid