Table 1. ¹H (500 MHz) and ¹³C (150 MHz) NMR Data for Compounds 1–3 in DMSO-d₆.

	1		2		3
position	δC, type	δH (J in Hz)	δC, type	δH (J in Hz)	δC,a type	δH (J in Hz)
1	199.5, C		198.1, C		197.7, C
2	49.6, C		48.6, C		49.9, C
3	43.9, CH	3.62b	42.2, CH	4.09 m	41.8, CH	4.16 br s
4	127.6, CH	5.36 ddd (10.2, 4.7, 2.1)	128.3, CH	5.34 ddd (10.0, 5.2, 2.6)	128.2, CH	5.38 br s
5	130.5, CH	5.42 d (10.2)	130.0, CH	5.27 d (10.0)	130.4, CH	5.38 br s
6	38.4, CH	1.77b	33.3, CH	2.10 t (10.7)	38.5, CH	1.67 m
7	37.0, CH2	0.76 q (12.0)	46.4, CH2	1.04 d (11.5)	37.1, CH2	0.71 q (11.8)
		1.86 d (12.0)		1.59 d (11.5)		1.82 d (11.8)
8	41.4, CH	1.46*	68.1, C	3.91 s (OH)	41.2, CH	1.44 m
9	30.4, CH2	0.99 q (12.0)	40.1, CH2	1.30 m	30.5, CH2	0.95 br d (13.8)
		1.75 m		1.50 d (12.9)		1.69 m
10	27.7, CH2	0.89 q (12.0)	22.9, CH2	1.10 m	27.2, CH2	0.73b
		1.96 br s		1.61 br d (11.9)		1.92 br d (10.0)
11	40.6, CH	1.54 m	40.4, CH	1.43 m	40.4, CH	1.48 m
12	14.4, CH3	1.30 s	14.7, CH3	1.24 s	14.6, CH3	1.24 s
13	132.6, CH	5.14 m	134.3, CH	5.14 dd (15.4,6.9)	132.9, CH	5.30 dd (15.4, 7.0)
14	125.8, CH	5.14 m	123.1, CH	5.07 dq (15.4, 6.0)	130.5, CH	5.22 dt (15.4, 5.4)
15	18.3, CH3	1.48 d (4.8)	18.1, CH3	1.46 d (5.6)	62.1, CH2	3.74 br s
16	67.0, CH2	3.20 d (11.6)	31.8, CH3	1.08 s	67.0, CH2	3.21 br d (4.2)
		3.23 d (11.6)
2′	178.6, C		175.0, C		175.4, C
3′	101.2, C		101.5, C		ND
4′	191.2, C		188.5, C		189.2, C
5′	62.5, CH	3.64 m	64.7, CH	3.21 br s	65.3, CH (A)	3.19b (A)
					72.8, CH (B)	3.42 dd (10.9, 5.7) (B)
6′	62.8, CH2a	3.47 dd (11.1, 5.0)	61.8, CH2	3.54 dd (10.5, 5.1)	62.2, CH2 (B)	3.36b (a)
		3.63 dd (11.1, 2.8)		3.66 dd (10.5, 2.3)		3.29 dd (10.8, 5.7) (b)
					63.4, CH2 (A)	3.67 dd (10.8, 3.0) (a)
						3.54 dd (10.8, 5.0) (b)
NCH3			27.0, CH3	2.77 s	27.6, CH3	2.77 s
OH-16		4.36 br s				4.32 br s
OH-15						4.38 br s

^aδ_C determined by 2D experiments,

^bSuperposed with another signal; δ_H determined by analysis of 2D experiments.