Table 1.

¹H (500 MHz) and ¹³C NMR (125 MHz) Data for 1–3 and 6 in DMSO-d₆.

No	1		2		3
	δC, type	δH (J in Hz)	δC, type	δH (J in Hz)	δC, type	δH (J in Hz)
1		10.30, br s		10.43, br s		10.30, br s
2	176.2, C		175.3, C		177.9, C
3	74.9, C		76.2, C		72.3, C
3a	132.1, C		126.9, C		128.6, C
4	123.9, CH	7.16, d, 1 H (6.7)	124.1, CH	7.08, d, 1 H (7.5)	126.3, CH	7.04, d, 1 H (7.4)
5	121.4, CH	6.88, dd, 1 H (7.5, 7.5)	121.5, CH	6.90, dd, 1 H (7.5, 7.5)	120.9, CH	6.88, dd, 1 H (7.5, 7.5)
6	129.2, CH	7.18, dd, 1 H (7.7, 6.2)	130.1, CH	7.22, dd, 1 H (7.7, 7.7)	129.4, CH	7.13, dd, 1 H (7.5, 7.6)
7	109.4, CH	6.80, d, 1 H (7.6)	109.9, CH	6.78, d, 1 H (7.7)	109.2, CH	6.70, d, 1 H (7.5)
7a	143.0, C		142.6, C		142.3, C
8	117.5, CH	5.80, s, 1 H			41.7, CH2	2.57, s, 2 H
1′	130.4, C		66.1, CH	4.40, s, 1 H	83.4, C
3′	153.3, C		157.2, C		155.6, C
5′	161.3, C		168.6, C		172.3, C
2′-NCH3	26.1, CH3	3.04, s, 3 H	31.3, CH3	3.14, s, 3 H	24.4, CH3	2.55, s, 3 H
4′-NCH3	24.4, CH3	2.83, s, 3 H	24.2, CH3	2.50, s, 3 H	23.7, CH3	2.19, s, 3 H
3-OH		6.85, s		6.62, s		6.70, s
1′-OH						6.00, s