Fig. 2. Assignment of the 2D HSQC NMR spectrum of unfractionated Indulin AT kraft lignin. The structures are used to show the native linkages and their kraft-derived products. Structures and contours are color coded to aid interpretation. See Fig. S1–S10† for more detailed assignments of structural units and Fig. S11† for HMBC analysis supporting the assignment of S2/6 units.
