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Chemical structure of 5-aminolevulinic acid (A) and general structures of its ester (B) and amide (C) derivatives and aminomethane tris-methyl ALA (D) which contains three ALA residues coupled via ester linkages to a central core. This type of dendron forms the building block for the 2nd generation 6-ALA and 3rd generation 18-ALA dendrimers.115
