label: Fe-coproporphyrin III + 2 5'-deoxyadenosine + 2 L-methionine + 2 acetate + 2 A + 2 H(+) => 12,18-didecarboxysiroheme + 2 AH2 + 2 S-adenosyl-L-methionine
label_lc: fe-coproporphyrin iii + 2 5'-deoxyadenosine + 2 l-methionine + 2 acetate + 2 a + 2 h(+) => 12,18-didecarboxysiroheme + 2 ah2 + 2 s-adenosyl-l-methionine