Delta-6 desaturase (20:5(5Z,8Z,11Z,14Z,17Z)/18:3(6Z,9Z,12Z))(PC sn-2)
2.0 nadh_c + o2_c + 2.0 ficytb5_c + pc205n3182n6_c ⇌ 2.0 h2o_c + 2.0 nad_c + 2.0 focytb5_c + pc205n3183n6_c