Table 3.

Assignments of main AL and DLs ¹³C-¹H cross-signals in the HSQC spectra.

Label	δC/δH (ppm)	Assignment
–OCH3	55.6/3.74	C−H in methoxyls
Aγ	59.5–59.7/3.40–3.63	Cγ−Hγ in β-O-4′ substructures (A)
Bγ	71.3/3.99 and 71.3/4.37	Cγ−Hγ in resinol substructures (B)
S2,6	103.7/6.71	C2,6−H2,6 in etherified syringyl units (S)
S′2,6	106.3/7.25	C2,6−H2,6 in oxidized (Cα=O) syringyl units (S′)
G2	112.9/6.98	C2−H2 in guaiacyl units (G)
G5	115.0/6.77	C2−H2 in guaiacyl units (G)
G6	119.0/6.80	C6−H6 in guaiacyl units (G)