Table 2 ¹H and ¹³C NMR data (DMSO-d₆, 600 and 150 MHz) of 1

1

7.95, d (7.8)

120.6, CH

H-2

C-3, 10

2

7.86, dd (7.8, 8.4)

135.4, CH

H-1, 3

C-4, 10a

3

7.70, d (8.4)

123.6, CH

H-2

C-1, 4a

4

–

156.8, C

–

–

4a

–

122.3, C

–

–

5

–

181.2, C

–

–

5a

–

133.4, C

–

–

6

7.61, d (7.8)

118.2, CH

H-7

C-8, 9a, 5

7

7.78, d (7.8)

141.0, CH

H-6

C-5a, 9

8

–

133.4, C

–

–

9

–

160.3, C

–

–

9a

–

115.1, C

–

–

10

–

188.9, C

–

–

10a

–

135.2, C

–

–

11a

11b

2.88, d (13.2)

3.03, d (13.2)

40.1, CH₂

–

C-7, 9

12

–

71.5, C

–

–

13

2.40, s

46.7, CH₂

–

C-11

14

–

172.8, C

–

–

15

1.19, s

26.8, CH₃

–

C-11, 13

1′

5.64, d (1.8)

99.3, CH

H-2′

C-4′, 5′

2′

3.99, m

70.5, CH

H-1′

C-1′

3′

3.99, m

70.5, CH

H-4′

–

4′

3.33, m

72.0, CH

H-3′

–

5′

3.52, m

70.4, CH

H-4′, 6′

–

6′

1.09, d (6)

18.4, CH₃

H-5′

C-5′, 4′