Table 1. ¹H and ¹³C NMR spectroscopic data for compounds 1-6^a.

Position	1 and 2b		3 and 4b		5 and 6c
	δC, type	δH (J in Hz)	δC, type	δH (J in Hz)	δC, type	δH (J in Hz)
1	151.4, C		149.1, C		147.4, C
2	118.5, CH	6.67, br s	123.6, C		122.0, C
3	123.6, C		113.5, CH	6.47, d (2.8)	113.2, CH	6.87, d (2.8)
4	118.4, CH	6.67, br s	151.6, C		149.6, C
5	149.4, C		117.4, CH	6.60, dd (8.6, 2.8)	117.0, CH	6.61, dd (8.4, 2.8)
6	114.8, CH	6.94, br s	117.4, CH	6.67, d (8.6)	117.1, CH	6.66, d (8.4)
1'	108.7, C		80.0, CH	6.23, br s	106.5, C
2'	147.9, CH	7.40, br s	151.0, CH	7.35, br s	145.9, CH	7.38, d (1.0)
3'	136.7, C		133.7, C		134.9, C
4'	26.3, CH2	2.27, t (6.8)	26.4, CH2	2.30, t (7.2)	24.8, CH2	2.20, t (7.6)
5'	25.9, CH2	1.59, m	26.1, CH2	1.61, m	24.2, CH2	1.49, m
6'	31.5, CH2	1.31, m	31.6, CH2	1.43, m	30.0, CH2	1.22, m
7'	41.0, CH	1.47, m	41.1, CH	1.50, m	39.4, CH	1.37, o
8'	31.7, CH2	1.40, m	31.7, CH2	1.34, m	30.3, CH2	1.36, o
9'	26.1, CH2	2.06, td (7.2, 7.2)	26.2, CH2	2.08, m	24.5, CH2	1.98, td (7.6, 7.2)
10'	130.8, CH	5.49, t (6.6)	130.8, CH	5.50, br s	129.1, CH	5.46, t (6.8)
11'	131.7, C		131.7, C		129.9, C
12'	71.2, CH2	4.55, br s	71.2, CH2	4.55, br s	69.0, CH2	4.50, br s
13'	14.3, CH3	1.68, s	14.3, CH3	1.69, d (3.7)	13.7, CH3	1.61, s
14'	173.6, C		176.9, C		171.0, C
15'	65.4, CH2	3.46, br d (3.7)	65.5, CH2	3.48, br d (4.8)	63.0, CH2	3.29, br d (4.4)
1''	169.3, C		169.3, C		166.4, C
2''	115.3, CH	6.33, d (15.6)	115.4, CH	6.33, d (16.0)	114.0, CH	6.40, d (16.0)
3''	146.7, CH	7.60, d (15.6)	146.7, CH	7.60, d (16.0)	144.7, CH	7.55, d (16.0)
4''	127.3, C		127.3, C		124.9, C
5''9''	131.3, CH2	7.45, d (8.4)	131.3, CH2	7.45, d (8.6)	130.3, CH2	7.54, d (8.4)
6''8''	117.0, CH2	6.80, d (8.4)	117.0, CH2	6.79, d (8.6)	115.8, CH2	6.78, d (8.4)
7''	161.4, C		161.4, C		160.0, C
OCH3	52.3, CH3	3.27, s			51.0, CH3	3.16, s

^{a 1}H NMR, 400 MHz; ¹³C NMR, 100 MHz. The assignments were based on HSQC and HMBC experiments. The ¹H and ¹³C NMR data were identical for each pair of enantiomers.

^b Measured in CD₃OD.

^c Measured in DMSO-d₆.