1.3.98.5 Fe-coproporphyrin III + 2 H2O2 - 1.3.98.5 Fe-coproporphyrin III + H2O2 - 1.3.98.5 Fe-coproporphyrin III + H2O2 overall reaction 1.3.98.5 harderoheme III + H2O2 - 1.3.98.5 harderoheme IV + H2O2 -