Table 2.

¹H (700 MHz) and ¹³C (175 MHz) NMR spectroscopic data^a for 3,5,3′-trihydroxy-7,4′-dimethoxy-6,8-C-dimethyl-flavone (2).

Position	δC	δH, m (J in Hz)	HMBCb
2	145.8
3	136.2
4	175.9
5	156.0
6	113.4
7	163.0c
8	109.4
9	152.4
10	105.8
1′	124.6
2′	113.7	7.82, d (2.1)	C-2, C-6′
3′	145.8
4′	148.4
5′	110.7	7.00, d (9.1)	C-1′, C-3′
6′	121.1	7.87, dd (9.1, 2.1)	C-2, C-2′
6-CH3	8.4	2.23, s	C-5, C-6, C-7
8-CH3	8.7	2.41, s	C-7, C-8, C-9
7-OCH3	60.8	3.80, s	C-7
4′-OCH3	56.2	4.00, s	C-4′
3-OH		6.64	C-3, C-4
3′-OH		5.71	C-2′, C-3′
5-OH		11.80	C-5, C-10

^a1H and ¹³C chemical shifts with reference to CDCl₃ (δ_H = 7.26 ppm) and CDCl₃ (δ_C = 77.16 ppm), respectively.

^bHMBC correlations are from the proton stated to the indicated carbon.

^cobtained from HMBC