Table 1.

¹H NMR Data for compounds 4, 8, 13, and 14 (500 MHz in CDCl₃)^a.

position	4	8	13	14
2	4.12, dd (11.4, 7.1)	4.08, dd (11.4, 7.1)	4.06, d (11.2)	4.09, d (11.2)
	4.28, dd (11.4, 4.1)	4.25, dd (11.4, 4.1)	4.23, d (11.2)	4.36, d (11.2)
3	2.80, m	2.78, m
6	6.06, d (2.3)		6.11, d (2.3)	6.16, s
8	5.97, d (2.3)	6.05, s	6.05, d (2.3)
9	2.65, dd (13.9, 10.4)	2.69, dd (13.8, 10.6)	2.89, d (13.8)	2.94, d (14.1)
	3.12, dd (13.9, 4.5)	3.16, dd (13.8, 4.5)	2.93, d (13.8)	2.98, d (14.1)
10	3.81, s		3.85, s	3.91, s
11			3.88, s	3.83, s
12		3.91, s
2′	6.75, d (1.3)	7.08, d (8.5)	6.82, d (2.1)	7.04, d (8.5)
3′		6.78, d (8.5)		6.75, d (8.5)
5′	6.81, d (7.9)		6.76, d (8.1)
6′	6.66, dd (7.9, 1.3)		6.65, dd (8.1, 2.1)
3-OH			3.36, s
5-OH	12.11, s	11.78, s	11.25, s	11.21, s
6-OH		5.03, br. s
7-OH		4.81, br. s
3′-OH	5.20 or 5.33b, br. s		5.58, s
4′-OH	5.20 or 5.33b, br. s			4.83, br. s

^aδ in ppm, mult (J in Hz);

^bCould be swapped