Procedures for esterified hemin-styrene (H-Styr) conjugation: This was performed according to Liu et al., 2008, with some modifications. To a flask fitted with a condenser and containing freshly distilled THF (4 mL), diesterified hemin (100 mg, 0.147 mmol, 1.0 eq.) was added under nitrogen atmosphere. After stirring the mixture for 15 minutes at room temperature under the exclusion of light, styrene (630 μL, 5.9 mmol, 40 eq.) was injected to it. Grubbs Catalyst (35 mg, 0.037 mmol, 0.25 eq.) was then added and the reaction mixture was refluxed mildly under nitrogen for one hour at 67 o C. Next, the solvent was removed in vacuo, and the residues were purified using a silica gel column (solvent: CH2Cl2:CH3OH