Table 2 NMR spectroscopic data of compound 2 (500 and 125 MHz, CDCl₃, respectively)

1

1.64, 2 H, m

37.0 t

H₂, H₁₁

-

-

2

1.92, 2 H, m

21.2 t

H_1, H₃

-

-

3

1.52, 2 H, m

27.1 t

H_2, H₄

-

-

4

1.79, 1 H, m

37.6 d

H₃

-

H₁₁

5

-

41.2 s

-

-

6

6 a: 2.36, 1 H, d (13.6)

6 b: 2.40, 1 H, d (13.6)

42.4 t

-

C-4, C-5, C-7, C-11

-

7

-

175.7 s

-

-

-

8

4.32, 1 H, m

69.7 d

H_12a, H_12b

-

H_13, H_14, H₁₅

9

-

161.7 s

-

-

-

10

-

40.3 s

-

-

-

11

1.34, 1 H, m

49.5 d

H₁

-

H-4

12

12 a: 1.23, 1 H, m

12 b: 2.24, 1 H, m

37.3 t

H₈

-

-

13

0.94, 3 H, d (6.6)

16.2 q

H-4

C-3, C-4, C-5

H_8, H_14, H₁₅

14

0.86, 3 H, s

17.2 q

-

C-4, C-6, C-11

H_8, H_13, H₁₅

15

1.06, 3 H, s

21.0 q

-

C-9, C-10, C-11,

C-12

H_8, H_13, H₁₄

16

16 a: 4.75, 1 H, brs

16 b: 4.94, 1 H, brs

99.7 t

-

C-8, C-10

-