Table 2.

¹H and ¹³C NMR data (δ in ppm, J in Hz) of isookanin in methanol-d₄ (500 MHz).

Position	Compound 2
	δ C	δH (J in Hz)
2	81.6	5.37, dd (12.4, 2.9)
3	45.1	ax 3.06, dd (16.9, 12.4), eq 2.72 (16.9, 3.0)
4	194.0
5	119.3	7.30, d (8.7)
6	110.9	6.52, d (8.7)
7	154.0
8	134.0
9	152.7
10	115.7
1′	131.9
2′	115.0	6.98, d (1.9)
3′	146.5
4′	146.9
5′	116.2	6.78, d (8.1)
6′	119.6	6.85, dd (8.1, 1.9)