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. 2024 Oct 1;16(19):2791. doi: 10.3390/polym16192791

Figure 5.

Figure 5

2D-HSQC NMR spectrum of extracted lignin with variation in the temperature; 130 °C, 150 °C, and 170 °C (15 min). (AC): side-chain regions: (A′C′): aromatic regions.