L-Penicillamine is a metabolite of penicillin that acts as a copper chelating agent.
TOKU-E offers both D-penicillamine (P107) and L-penicillamine (P112). While they are enantiomers of each other with equal copper chelating ability, L-penicillamine has a high toxicity in humans.
|References||Smith, S. W. (2009). Chiral toxicology: It’s the same thing...Only different. Toxicological Sciences, 110(1), 4–30. doi:10.1093/toxsci/kfp097|