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Benzoic acid,4,4'-[[2-[[3-(4-carboxyphenoxy)-2,2-bis[(4-carboxyphenoxy)methyl]propoxy]methyl]-2-[(4-carboxyphenoxy)methyl]-1,3-p 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- 98% 100mg