Fig. 2From: Sequential catalytic lignin valorization and bioethanol production: an integrated biorefinery strategy2D HSQC NMR spectrums of the lignin oil fractionated by different proportion of 2-PrOH:H2O (v/v) in the initial liquor. a–e The side chain region, and f–j the aromatic ring region of the lignin oil specimensBack to article page