Table 3.

¹H NMR Spectroscopic Data (500 MHz) for 4–6^a

C#	4	5	6b
2-Me	1.29 s	0.98 s	1.33 s
2-Me	1.36 s	1.46 s	1.51 s
3	4.37 dd (3.3,	5.27 s	3.93 dd
4a	2.33 dd (3.3,	6.73 s	2.11 m
	2.70 dd (12.1,		2.49 m
4b			3.15 dd
6-OH	11.16 s	12.55 s	12.20 s
7		6.63 s	6.71 s
9	6.75 s	6.94 s	7.48 s
11	2.22 m	2.09 m	1.93 m
		2.19 m	2.03 m
12	4.64 dd (6.1,	2.01 m	1.46 m
14	1.64 m	1.74 m	1.90 m
	1.95 m	2.01 m	1.90 m
15	1.96 m	1.83 m	1.75 m
	1.96 m	2.17 m	1.92 m
16	5.47 d (10.4)	4.65 dd (4.0, 12.0)	3.53 dd
17a-Me		0.58 s	0.43 s
17b-Me		1.06 s	0.72 s
18	2.99 d (15.3) 3.32 m b
19	4.53 dd (3.5, 4.83 d (9.0)
20	0.98 s	4.18 s, 4.72s	1.24 s

^aChemical shifts are in ppm; J values in Hz are in parentheses; Measured in DMSO-d₆.

^bMeasured in CDCl₃.