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(a) Schematic of the structure of monomer C9 units; and (b) schematic of the proposed lignin structure with several linkages (B1: β-O-4, B2: α-O-4, B3: β-5, B4: β-1, B5: 5-5, B6: β-β, B7: 4-O-5) [44], reproduced with permission from Springer.
