Table 1 ¹H NMR (400 MHz), ¹³C NMR and DEPT (100 MHz), H–H COSY and HMBC spectroscopic data for Compound 1 in CD₃OD

1

202.82

2

6.08 (1H, d, J = 9.87)

131.97 (CH)

H-3, H-4

C-1, C-3, C-4, C-10

3

6.96 (1H, dd, J = 9.2, 6.2)

143.66 (CH)

H-2, H-4

C-1, C-4, C-5

4

3.56 (1H, d, J = 6.10)

69.71 (CH)

H-2, H3

C-2, C-3, C-10

5

63.41

6

3.11 (1H, brs)

60.57 (CH)

C-4, C-7, C-8

7

29.09 (CH₂)

8

33.8 (CH)

9

37.06 (CH)

10

49.0

11

25.81 (CH₂)

12

29.62 (CH₂)

13

54.11

14

82.46

15

31.80 (CH₂)

16

36.78 (CH₂)

17

87.22

18

1.18 (3H, S)

19.21 (CH₃)

19

1.26 (3H, S)

15.23 (CH₃)

20

78.42

21

1.29 (3H, S)

18.03 (CH₃)

22

4.80 (1H, m)

81.43 (CH)

23

34.25 (CH₂)

24

152.10

25

120.51

26

167.68

27

1.86 (3H, S)

13.02 (CH₃)

28

1.74 (3H, S)

10.98 (CH₃)