Properties of Flavonoids Isolated from the Bark of Eysenhardtia polystachya and Their Effect on Oxidative Stress in Streptozotocin-Induced Diabetes Mellitus in Mice

Table 2

¹H NMR and ¹³C NMR spectral data for compounds 5-6 ( in ppm, in Hz).

	5		6
	δH	δC	δH	δC
1	—		7.15, d (1H, 8.5)	128.72
2	—	198.16	6.52, d (1H, 8.5)	110.83
3	7.96, d (1H, 10.1)	143.48	—	147.76
4	7.71, d (1H, 10.1)	126.69	—	115.84
4a	—	105.95	—	154.59
5		143.41	—	—
6α	6.41, s	105.82	3.59, t (1H, 10.2)	69.37
6β	—	—	4.31, dd (1H, 4.9, 10.2)	69.55
6a	—	—	3.50, (1H, m, 10.2, 7.0, 5.0)	40.48
6b	—	—	—	116.56
7		168.38	6.73, s	108.07
8		105.08	—	152.51
8a		159.81	—	—
9			—	163.17
10			6.49, s	99.01
10a			—	154.59
11a			5.20, d (1H, 7.0)	77.75
11b			—	112.23
1′		204.19	3.43, d (2H, 8)	24.61
2′	7.31, d (1H, 15.4)	142.54	5.29, d (1H, 8)	121.62
3′	7.47, d (1H, 15.4)	132.26	—	137.49
4′	—	132.68	1.81, 3H, s	18.75
5′	6.26, 1H, m	108.31	1.70, 3H, s	24.61
6′	—	166.38	—	—
7′	6.32 (1H, dd, 1.7, 1.7)	105.79
8′	—	166.12
9′	6.40, 1H, m	101.24
OMe-3	—	—	3.11, s	55.57
OMe-8	—	—	3.35, s	60.64
OH-9	—	—	8.12, s	—