Antitrypanosomal agent 1 is a potent and selective trypanothione reductase (TR) inhibitor with an IC50 of 3.3 μM. Antitrypanosomal agent 1 inhibits glutathione reductase (GR) (IC50=64.8 μM) and T. brucei (EC50=1 μM). Antitrypanosomal agent 1 has anti-trypanosomal activity.