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Structural features of the aromatic region of the wood lignin for the species of Cactaceae studied. (A) Aromatic/unsaturated region (δC/δH 90–150/6.3–7.7 ppm) in the HSQC spectra. (B) Structures of the main aromatic units identified. In the LBHK structures: R = G, G-LBHK; R = S, S-LBHK (the corresponding signals were overlapped with others related to S units). Assignments for the cross-peaks in each structure are shown in Table 2.
