(6Z,9Z,12Z)-octadecatrienoyl-containing glycerolipid + 2 Fe(II)-[cytochrome b5] + O2 + 2 H(+) => a (9Z,12Z)-octadeca-9,12-dien-6-ynoyl-containing glycerolipid + 2 Fe(III)-[cytochrome b5] + 2 H2O
(6z,9z,12z)-octadecatrienoyl-containing glycerolipid + 2 fe(ii)-[cytochrome b5] + o2 + 2 h(+) => a (9z,12z)-octadeca-9,12-dien-6-ynoyl-containing glycerolipid + 2 fe(iii)-[cytochrome b5] + 2 h2o
(6Z,9Z,12Z)-octadecatrienoyl-containing glycerolipid + 2 Fe(II)-[cytochrome b5] + O2 + 2 H(+) => a (9Z,12Z)-octadeca-9,12-dien-6-ynoyl-containing glycerolipid + 2 Fe(III)-[cytochrome b5] + 2 H2O
(6z,9z,12z)-octadecatrienoyl-containing glycerolipid + 2 fe(ii)-[cytochrome b5] + o2 + 2 h(+) => a (9z,12z)-octadeca-9,12-dien-6-ynoyl-containing glycerolipid + 2 fe(iii)-[cytochrome b5] + 2 h2o