label: Fe-coproporphyrin III + 2 S-adenosyl-L-methionine = heme b + 2 5'-deoxyadenosine + 2 L-methionine + 2 CO2
label_lc: fe-coproporphyrin iii + 2 s-adenosyl-l-methionine = heme b + 2 5'-deoxyadenosine + 2 l-methionine + 2 co2