Table 1.

¹H and ¹³C NMR data of compounds 1 and 2 (DMSO-d₆, δ in ppm, J in Hz).

Position	Compound 1			Compound 2
	δCa	δH (J in Hz) b		δCa	δH (J in Hz) b
1	20.04	1.16 d (6.5)		20.02	1.14 d (6.5)
2	65.7	4.20 m		65.7	4.16 m
2-OH		5.09 s			5.05 s
3	58.6	4.45 dd (8.0, 4.5)		58.7	4.45 dd (7.8, 4.3)
4	169.3			169.3
6	69.3	4.98 dq (6.5, 5.5)		69.3	4.96 dq (6.5, 6.5)
7	73.0	5.23 dd (10.0, 5.5)		73.4	5.22 dd (7.0, 6.5)
8	38.8	2.69 m		38.8	2.67 m
9	174.5	12.60 s		174.6	12.60 s
6-Me	14.88	1.19 d (6.5)		14.59	1.14 d (6.5)
8-Me	11.22	1.00 d (7.0)		11.25	0.96 d (7.0)
1′	113.9			113.6
2′	150.7			150.5
3′	127.0			126.6
4′	124.2	8.27 d (8.0)		124.3	8.26 d (8.0)
5′	117.8	6.92 t (8.0)		117.8	6.91 t (8.0)
6′	122.9	7.80 d (8.0)		122.1	7.77 d (8.0)
1′-CONH	170.0	8.81 d (8.0)		169.6	8.80 brs
2′-OH		13.00 s			13.00 s
3′-NHCHO		9.83 brs			9.83 brs
3′-NHCHO	160.5	8.32 d (1.5)		160.3	8.32 d (2.0)
1′′	172.2			170.5
2′′	31.2	2.26 m		39.9	3.66 s
3′′	32.8	1.37 m		133.8
4′′	26.6	1.50 m		129.1	7.23 d (8.0)
5′′	21.74	0.84 d (7.0)		128.0	7.31 t (8.0)
6′′	21.74	0.82 d (6.5)		126.6	7.25 t (8.0)
7′′				128.0	7.31 t (8.0)
8′′				129.1	7.23 d (8.0)

^a Recorded at 500 MHz; ^b Recorded at 125 MHz.