obsolete 1-16:0-2-18:2-phosphatidylcholine desaturase activity (obsolete GO:0102872)
OBSOLETE. Catalysis of the reaction: 1-palmitoyl-2-linoleoyl-phosphatidylcholine + O2 + a reduced electron acceptor = 1-16:0-2-18:3-phosphatidylcholine + 2 H2O + an oxidized electron acceptor.