Table 2.

¹H and ¹³C NMR chemical shifts for compounds 5 and 6.

Position	5		6
	δH, m (J in Hz) a	δC b, type	δH, m (J in Hz) c	δC d, type		δH, m (J in Hz) c	δC d, type
1		160.4, C		141.4, C	1′		141.5, C
2	4.95, d (10.0)	78.4, CH	5.28, d (10.0)	82.7, CH	2′	5.50, d (10.0)	81.9, CH
3	4.42, d (10.0)	124.6, CH	5.06, d (10.0)	126.4, CH	3′	4.92, d (10.0)	125.1, CH
4		139.2, C		140.2, C	4′		141.0, C
5α	1.95, m	44.6, CH2	2.21, m	38.5, CH2	5′α	2.21, m	38.8, CH2
5β	2.47, br d (11.0)		2.32, m		5′β	2.31, m
6	4.58, ddd (11.0, 9.5, 2.5)	78.9, CH		24.2, CH2	6′		24.2, CH2
6α			2.07, m		6′α	2.07, m
6β			2.42, m		6′β	2.42, m
7	4.78, d (9.5)	126.6, CH	4.98, dd (9.2, 9.2)	125.6, CH	7′	4.95, dd (9.2, 9.2)	125.5, CH
8		143.8, C		133.1, C	8′		133.3, C
9α	1.65, m	29.8, CH2	1.96, m	36.6, CH2	9′α	1.96, m	36.6, CH2
9β	2.52, dd (14.0, 4.5)		2.27, m		9′β	2.27, m
10α	1.28, m	23.4, CH2	1.22, m	23.6, CH2	10′α	1.22, m	23.7, CH2
10β	1.62, m		2.04, m		10′β	2.04, m
11	1.97, m	63.3, CH	2.51, m	62.1, CH	11′	2.51, m	62.2, CH
12		61.5, C		61.2, CH	12′		61.3, C
13α	1.59, m	37.6, CH2	1.83, m	37.3, CH2	13′α	1.83, m	37.4, CH2
13β	0.64, m		0.95, m		13′β	0.95, m
14α	2.07, m	23.7, CH2	2.33, m	22.6, CH2	14′α	2.33, m	22.7, CH2
14β	1.61, m		1.81, m		14′β	1.81, m
15		124.3, C		124.9, C	15′		124.9, C
16		174.3, C	6.13, br s	114.3, C	16′	6.17, d (3.6)	114.4, CH
17	1.63, s	9.4, CH3	1.72, s	10.2, CH3	17′	1.73, s	10.2, CH3
18	1.29, s	17.3, CH3	1.58, s	14.6, CH3	18′	1.59, s	14.6, CH3
19	1.34, s	22.5, CH3	1.65, s	14.7, CH3	19′	1.65, s	14.7, CH3
20	0.98, s	16.9, CH3	1.27, s	15.7, CH3	20′	1.27, s	15.7, CH3
6-OOH	7.25, br s

^a Spectrum recorded at 500 MHz in C₆D₆. ^b Spectrum recorded at 125 MHz in C₆D₆. ^c Spectrum recorded at 400 MHz in CDCl₃. ^d Spectrum recorded at 100 MHz in CDCl₃.