obsolete 1-18:3-2-16:2-monogalactosyldiacylglycerol desaturase activity (obsolete GO:0102847)
OBSOLETE. Catalysis of the reaction: 1-18:3-2-16:2-monogalactosyldiacylglycerol + O2 + a reduced electron acceptor = 1-18:3-2-16:3-monogalactosyldiacylglycerol + 2 H2O + an oxidized electron acceptor.