Fig. 6. Main interunit linkages and aromatic units of KL and the fractions identified by HSQC, A: β-O-4′ linkages; B: β–5′ linkages; C: β–β′ linkages; FA: ferulates; pCA: p-coumarates; S: syringyl units; S′: C_α-oxidized syringyl unit; G: guaiacyl unit; H: p-hydroxyphenyl unit.