Table 2. Assignment of ¹³C–¹H Cross-Signals in the HSQC Spectra of OLR.

	δC/δH	assignment
Cβ	53.62/3.47	Cβ–Hβ in phenylcoumarin substructures (C)
Bβ	54.15/3.06	Cβ–Hβ in resinol substructures (B)
–OMe	56.26/3.74	C–H in methoxyls
Aγ	58.98–60.56/3.40–3.72	Cγ–Hγin β-O-4′ substructures (A)
Aγ′	63.96/4.37–4.47	Cγ–Hγ in γ-acylated β-O-4′substructures (Aγ and A′)
Bγ	71.65/3.91 and 4.19	Cγ–Hγ in resinol substructures (B)
(A, Aγ)α	72.52/4.83	Cα–Hα in β-O-4′ substructures (A) and γ-acylated β-O-4′ substructures (A′)
Bα	85.55/4.67	Cα–Hα in resinol substructures (B)
Cα	87.48/5.44	Cα–Hα in phenylcoumaran substructures (C)
X5	60.20/3.40 and 3.73	C5–H5 in β-d-xylopyranoside
S2,6	103.94/6.68	C2,6–H2,6 in etherified syringyl units (S)
S2,6′	106.21/7.23 and 7.05	C2,6–H2,6 in oxidized (Cα=O) syringyl units (S′)
G2	111.36/6.95	C2–H2 in guaiacyl units (G)
G5	115.64/6.81	C5–H5 in guaiacyl units (G)
G6	119.67/6.81	C6–H6 in guaiacyl units (G)
PB2,6	131.84/7.69	C2,6–H2,6 in p-hydroxybenzoate substructures (PB)