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Examples of phytochelators containing a thiol or pterin in the metal binding site. Phytochelatin (n = 2–11) (30), glutathione or (2S)-2-amino-5-[[(2R)-1-(carboxymethylamino)-1-oxo-3-sulfanylpropan-2-yl]amino]-5-oxopentanoic acid (31), dihydrolipoic acid (6,8-dimercapto-octanoic acid) (32), folic acid or (2S)-2-[[4-[(2-amino-4-oxo-1H-pteridin-6-yl)methylamino]benzoyl]-amino]pentanedioic acid (33) and pterin or 2-amino-1H-pteridin-4-one (34).
