4，4-[[2-[[3-(4-Carboxyphenoxy)-2，2-bis[(4-carboxyphenoxy)methyl]propoxy]methyl]-2-[(4-carboxyphenoxy)methyl]-1，3-propanediyl]bis(oxy)]bis[benzoic acid]

4，4-[[2-[[3-(4-Carboxyphenoxy)-2，2-bis[(4-carboxyphenoxy)methyl]propoxy]methyl]-2-[(4-carboxyphenoxy)methyl]-1，3-propanediyl]bis(oxy)]bis[benzoic acid] 98%