Hydrogen peroxide has been one of the reactants used to push the equilibrium to the NOS formation. H 2 O 2 is a complex oxidant entity which can be decomposed into other different ROS. In order to take this into account, in Figure path (d) we show the oxidation of the thiol moiety, leading to thyil radical, with three different oxidant molecules that can be formed departing from H 2 O 2 , as shown in Figure in (e).