label: 1-(9Z,12Z-octadecadienoyl)-2-acyl-sn-glycero-3-phosphocholine + 2 Fe(II)-[cytochrome b5] + O2 + 2 H(+) <=> 1-(9Z,12Z,15Z-octadecatrienoyl)-2-acyl-sn-glycero-3-phosphocholine + 2 Fe(III)-[cytochrome b5] + 2 H2O
label_lc: 1-(9z,12z-octadecadienoyl)-2-acyl-sn-glycero-3-phosphocholine + 2 fe(ii)-[cytochrome b5] + o2 + 2 h(+) <=> 1-(9z,12z,15z-octadecatrienoyl)-2-acyl-sn-glycero-3-phosphocholine + 2 fe(iii)-[cytochrome b5] + 2 h2o