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. 2016 Oct 18;9:217. doi: 10.1186/s13068-016-0632-9

Fig. 3.

Fig. 3

2D-HSQC spectra and the main structures of the lignins obtained from the integrated process under various processing conditions (side-chain region). β-aryl-ether units (a β-O-4) and phenylcoumaran substructures (b β-5)