A heterodetic cyclic peptide that is a cyclic enkephalin analogue, having D-penicillaminyl residues located at positions 2 and 5, which form the heterocycle via a disulfide bond.

Penicillamine is a pharmaceutical of the chelator class. The pharmaceutical form is D-penicillamine, as L-penicillamine is toxic (it inhibits the action of pyridoxine). It is an ?-amino acid metabolite of penicillin, although it has no antibiotic properties.

Tiopronin is a prescription thiol drug used primarily in the treatment of severe homozygous cystinuria. Patients with cystinuria excrete high levels of cystine in their urine and are at risk for kidney stone formation. Tiopronin is used as a second-line thera…

Triethylenetatramine (TETA), also known as trientine, is a potent and selective copper (II)-selective chelator. It is a structural analog of linear polyamine compounds, [spermidine] and [spermine]. TETA was first developed in Germany in 1861 and its chelating…