Table 2.

¹H NMR (600 MHz) and ¹³C NMR (150 MHz) data of compounds 4–6 (δ in ppm, J in Hz)

Position	4a		5a		6a
	δC, type	δH, multi.	δC, type	δH, multi.	δC, type	δH, multi.
1					131.2, s
2	178.7, s		79.5, s		144.7, d	6.67, d (3.9)
3	39.7, d	2.79, m	76.5, d	3.53, dd (8.6,6.1)	32.4, d	2.72, m
4	34.7, t	2.12, m 2.03, overlapped	69.6, d	4.51, dd (8.4,4.6)	71.0, t	4.37, dd (11.0,4.8)
						4.11, dd (11.0,7.2)
4a			125.9, s
5	75.4, d	4.65, m	129.5, d	7.48, d (2.1)
6	21.3, q	1.31, d (6.4), 3H	129.0, s		165.1, s
7	29.0, t	2.46, m	130.0, d	7.16, dd (8.3,2.1)	29.9, t	2.92, overlapped, 2H
		2.33, m
8	125.9, d	5.53, br. t (7.8)	117.2, d	6.70, d (8.3)	121.5, d	5.17, br. t (7.2)
8a			153.3, s
9	133.7, s		19.5, q	1.18, s, 3H	134.3, s
10	70.2, t	4.55, dd (12.4,2.8)	27.2, q	1.42, s, 3H	17.7, q	1.62, s, 3H
		4.51, dd (12.4,2.8)
11	14.0, q	1.69, s, 3H	27.2, t	4.99, s, 2H	25.8, q	1.70, s, 3H
12					34.3, t	1.65, m, 2H
13					59.8, t	3.66, m, 2H
1′	175.4, s		170.9, s
2′	67.5, d	4.25, overlapped	20.9, q	2.01, s, 3H
3′	20.8, q	1.34, d (6.6), 3H
3-OH				4.60, d (8.6)
4-OH				4.67, d (4.6)
13-OH						3.79, t (4.8)
2′-OH		4.24, overlapped

^aRecorded in acetone-d₆