A synthetic model compound for the metal bindingsite of bleomycin (PYML-4) with a -butyl group as a steric environmental factor showed improved oxygen-activation up to 71% of that of bleomycin.
ligand and a long alkyl chain as the steric factor around the 6th coordination site promoted reversible redox reaction and exhibited high oxygen activating ability. Kinetic analysis of the redox reaction in the presence of dioxygen and a reducing agent revealed that the presence of the carbamoylgroup on the DAPA moiety facilitates the oxygenation-activation process of the Fe(II) complex, and the reduction