label: (5Z,8Z,11Z,14Z,17Z)-eicosapentaenoyl-CoA + 2 Fe(III)-[cytochrome b5] + 2 H2O => (8Z,11Z,14Z,17Z)-eicosatetraenoyl-CoA + 2 Fe(II)-[cytochrome b5] + O2 + 2 H(+)
label_lc: (5z,8z,11z,14z,17z)-eicosapentaenoyl-coa + 2 fe(iii)-[cytochrome b5] + 2 h2o => (8z,11z,14z,17z)-eicosatetraenoyl-coa + 2 fe(ii)-[cytochrome b5] + o2 + 2 h(+)