4-Sulfophthalic acid, trisodium salt

4-Sulfophthalic Acid Trisodium Salt is an intermediate in the synthesis of Al(III) Phthalocyanine Chloride Tetrasulfonic Acid (A537003), a Phthalocyanine, which is a class of mammalian cell photosensitizer which may be useful in photodynamic therapy for cancer.

4-Sulfophthalic acid trisodium salt is formed as byproduct during the preparation of D&C Yellow No.10.