Biosynthetic pathway from ferulate to coniferyl alcohol and sinapyl alcohol for the formation of guaiacyl-syringyl lignin in angiosperms. 4CL, 4-coumarate:CoA ligase; CCR, cinnamoyl-CoA reductase; CAld5H, coniferyl aldehyde 5-hydroxylase; COMT, caffeate O-methyltransferase; CAD, cinnamyl alcohol dehydrogenase.