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Main lignin substructures cited in the spectra of Figure 5 and Figure 6: (A) β-O-4′ alkyl-aryl ethers; (A′) acetylated β-O-4′ substructures; (B) phenylcoumarans; (C) resinols; (I) p-hydroxycinnamyl alcohol end groups; (S) syringyl units; (H) p-hydroxyphenyl units; (G) guaiacyl units; (FA) formic acid; (PCA) p-coumarates.
