label: (9Z)-hexadecenoyl-CoA + 2 Fe(II)-[cytochrome b5] + O2 + 2 H(+) = (9Z,12Z)-hexadecadienoyl-CoA + 2 Fe(III)-[cytochrome b5] + 2 H2O
label_lc: (9z)-hexadecenoyl-coa + 2 fe(ii)-[cytochrome b5] + o2 + 2 h(+) = (9z,12z)-hexadecadienoyl-coa + 2 fe(iii)-[cytochrome b5] + 2 h2o