Table 1.

¹H and ¹³C NMR data for 1–3.

	1 a				2 b			3 b
C/H	δH c	mult (J in Hz)	δC c	C/H	δH c	mult (J in Hz)	δC c	δH c	mult (J in Hz)	δC c
1			198.9, s	1			201.2, s			200.4, s
2α	2.81	dd (16.0, 4.5), 1H	44.3, t	2α	2.81	dd (15.0, 4.5), 1H	46.8, t	2.99	dd (15.0, 4.5), 1H	45.6, t
2β	2.32	dd (16.0, 12.0), 1H		2β	2.64	dd (15.0, 10.0), 1H		2.38	dd (15.0, 10.0), 1H
3	2.08	m, 1H	37.0, d	3	2.29	m, 1H	39.6, d	2.24	m, 1H	38.2, d
3-	1.04	d (6.5), 3H	17.6, q	3-	1.20	d (6.5), 3H	18.9, q	1.18	d (6.5), 3H	18.0, q
Me				Me
4	4.22	dd (7.5, 6.0), 1H	71.4, d	4	4.55	d (6.5), 1H	74.4, d	4.43	d (6.5), 1H	73.4, d
4-	5.61	d (6.0), 1H		4-	4.69	brs, 1H		4.74	brs, 1H
OH				OH
4a			140.4, s	4a			139.9, s			140.1, s
5	7.49	d (8.5), 1H	127.6, d	5	7.59	d (8.5), 1H	130.5, d	7.63	d (8.5), 1H	129.4, d
6	7.00	d (8.5), 1H	122.2, d	6	7.03	d (8.5), 1H	122.0, d	7.05	d (8.5), 1H	121.9, d
6a			148.5, s	7			157.5, s			157.3, s
7	6.86	s, 1H	98.7, d	7-	8.83	brs, 1H		8.80	brs, 1H
7a			122.8, s	OH
8			153.6, s	7a			122.9, s			122.8, s
				7b			133.9, s			132.7, s
8-	3.85	s, 3H	55.6, q	1′			169.3, s			169.3, s
OMe				3′	7.43	s, 1H	76.4, d	7.41	s, 1H	76.5, d
9	6.94	t (8.5), 1H	111.5, d	3′a			153.9, s			153.8, s
10	7.27	t (8.5), 1H	131.5, d	4′	6.92	d (8.5), 1H	115.1, d	6.93	d (8.5), 1H	115.0, d
11	7.10	d (8.5), 1H	111.7, d	5′	7.54	t (8.5), 1H	136.2, d	7.54	t (8.5), 1H	136.1, d
11a			148.3, s	6′	7.04	d (8.5), 1H	111.3, d	7.04	d (8.5), 1H	111.2, d
12	6.68	s, 1H	77.3, d	7′			158.9, s			158.8, s
12a			125.9, s	7′a			116.0, s			115.8, s
12b			126.3, s	7′-	3.93	s, 3H	56.1, q	3.94	s, 3H	56.0, q
				OMe

^a DMSO-d₆, ^b acetone-d₆, ^{c 1}H, and ¹³C NMR spectra were recorded at 600 and 150 MHz, respectively.