Table 1 ¹H NMR data for compounds 1–6 in CDCl₃ (δ in ppm, J in Hz).

2

6.66, s

6.07, s

6.17, s

6.24, s

6.60, s

6.20, s

3

3.15, m

3.18, m

3.17, m

3.17, m

3.17, m

3.16, m

4

2.58, m

2.58, m

2.62, m

2.70, m

2.59, m

2.77, dd (2.4, 5.6)

5

2.58, m

2.61, m

2.55, m

2.56, m

2.59, m

2.56, m

7

5.35, s

5.37, brs

5.37, brs

5.44, brs

5.45, brs

5.43, brs

8

3.00, d (10.8)

3.05, d (10.2)

2.97, brd (9.2)

3.08, d (10.8)

3.21, m

3.06, d (10.4)

10a

1.15, m

1.16, m

1.18, m

1.16, m

1.17, m

1.18, m

10b

—

1.30, m

—

—

—

—

11

1.18, d (7.2)

1.21, d (6.6)

1.21, d (6.8)

1.22, d (7.2)

1.21, d (6.6)

1.24, d (7.2)

12

1.72, s

1.75, s

1.74, s

1.76, s

1.76, s

1.77, s

13

6.23, d (10.8)

6.25, d (10.8)

6.23, d (10.2)

6.19, d (10.8)

6.06, d (11.0)

6.19, d (11.2)

15a

2.17, d (12.6)

2.15, d (10.8)

2.16, brd (11.4)

1.98, m

1.88, m

1.95, m

15b

1.80, t (12.0, 24.0)

1.80, t (12.0, 24.6)

1.89, m

1.87, m

1.76, m

1.85, m

16

2.58, m

2.59, m

2.55, m

1.87, m

1.76, m

1.85, m

17a

2.60, m

2.56, m

2.78, m

1.98, m

1.98, m

1.95, m

17b

2.21, d (15.0)

2.30, d (16.0)

2.55, m

1.87, m

1.88, m

1.85, m

18

—

—

3.76, m

3.60, m

3.60, m

19a

2.76, m

5.01, dd (2.4, 10.8)

4.57, brd (8.0)

1.39, m

3.09, m

3.42, m

19b

—

—

—

1.87, m

—

—

20a

3.85, ddd (2.4, 11.4, 17.4)

2.92, m

4.16, dd (11.1, 17.4)

3.60, m

4.11, dd (2.2, 18.7)

4.20, d (17.6)

20b

2.40, ddd (,2.4, 7.8, 17.4)

—

2.55, m

1.92, m

1.93, m

1.90, m

22

1.58, m

1.56, m

1.54, m

1.55, m

1.58, m

1.54, m

23/24

0.90, d (6.6)

0.90, d (6.6)

0.91, d (6.0)

0.89, d (6.8)

0.90, d (6.6)

0.90, d (6.8)

25

1.36, s

1.35, s

1.43, s

1.55, s

1.53, s

1.54, s

26a

3.58, dd (4.8, 10.8)

3.61, dd (5.4, 10.8)

3.66, m

3.60, m

3.55, m

3.56, m

26b

3.41, dd (6.0, 9.6)

3.45, dd (7.2, 10.8)

3.53, t (7.3, 17.0)

3.35, m

3.33 t (9.2, 18.5)

3.34, t (9.2, 18.4)

27

—

3.34, s

—

—

3.51, s

—