Table 1 NMR spectral assignments for compound 1

C-1 (CH₂)

47.9

1.05 (2H, t, 11.5, 23.0)

C-2 (CHOH)

65.5

3.97 (1H, m)

C-3 (CH₂)

44.6

1.41 (2H, d, 11.5)

C-4 (C)

39.4

C-5 (CH)

47.5

1.47 (1H, dd, 2.5, 12.5)

C-6 (CH₂)

23.5

1.63 (2H, m)

C-7 (CH₂)

37.5

2.03 (2H, m)

C-8 (C)

147.4

C-9 (CH)

56.8

1.88 (1H, d, 10.5)

C-10 (C)

40.7

C-11 (CH₂)

23.2

2.38 (1H, m)

H-11b

2.37 (1H, m)

H-11a

C-12 (CH)

133.4

5.40 (1H, t, 6.0, 12.5)

C-9, C-11, C-14, C-16

C-13 (C)

133.6

C-14 (CH)

141.5

6.32 (1H, dd, 10.5, 17.5)

C-13, C-16

C-15 (CH₂)

110.0

5.05 (1H, d, 17.5)

C-13, C-14

H-14

4.88 (1H, d, 11.0)

H-14

C-16 (CH₃)

11.8

1.75 (3H, s)

C-17 (CH₂)

108.5

4.86 (1H, d, 1.5)

C-7, C-9

H-17b

4.49 (1H, d, 1.0)

H-17a

C-18 (CH₂OH)

71.5

3.42 (1H, d, 11.0)

C-3, C-4, C-5, C-19,

H-18b

3.18 (1H, d, 11.0)

H-18a

C-19 (CH₃)

18.5

0.80 (3H, s)

C-20 (CH₃)

15.8

0.81 (3H, s)