<unk>  is a prodrug, a complex of melarsen oxide (a melamine derivative of phenylarsonous acid) with dimercaprol (also known as British anti-Lewisite, or BAL). It is metabolized to melarsen oxide in the body, which then acts by irreversibly binding to sulfhydryl groups on the enzyme pyruvate kinase, thus disrupting energy production in the parasite. The inability to distinguish between the host's and the parasite's pyruvate kinase renders this drug highly toxic, with many side effects. Melarsen oxide also reacts with trypanothione (a spermidine-glutathione adduct that replaces glutathione in trypanosomes). It forms a melarsen oxide-trypanothione adduct (Mel T) that competitively inhibits trypanothione reductase, effectively killing the protist.
Melarsoprol
Trenbolone hexahydrobenzylcarbonate
Prosultiamine
Fursultiamine
Artemether
Quinine
Dimetacrine
Boron trichloride