Table 2 NMR spectroscopic data for compound 2a. aSpectra measured at 500 MHz in CDCl3.

From: Cytotoxic Serrulatane-Type Diterpenoids from the Gorgonian Euplexaura sp. and Their Absolute Configurations by Vibrational Circular Dichroism

No.

1H

13C

COSY

Key HMBC

1

2.49, m

33.0, CH

H-2, H-19

C-3, C-9

2

1.67, m

33.3, CH2

H-1, H-3

C-4, C-9

0.52, m

3

1.38, m

26.0, CH2

H-2, H-4

C-1, C-2, C-10

0.76, m

4

0.91, m

43.0, CH

H-3, H-10, H-11

C-2, C-13

5

2.01, m

28.3, CH

H-6, H-10

C-4, C-20

6

1.00, m

34.3, CH

H-5, H-7, H-20

C-5, C-8

7

1.51, m

40.8, CH2

H-6, H-8

C-5, C-20

1.16, m

8

4.08, d (5.5)

81.5, CH

H-7

C-6, C-7, C-9

9

0.79, m

40.8, C

—

—

10

—

40.8, CH

H-4, H-5

C-1, C-3

11

1.38, m

38.4, CH

H-4, H-12, H-13

C-3, C-12, C-14

12

0.89, d (6.5)

16.9, CH3

H-11

C-4, C-13

13

1.56, m

34.2, CH2

H-11, H-14

C-12, C-15

1.17, m

14

2.03, m

25.9, CH2

H-13, H-15

C-11, C-13, C-16

1.90, m

15

5.11, t (6.5)

125.0, CH

H-14

C-16, C-17, C-18

16

—

131.7, C

—

—

17

1.61, s

17.7, CH3

—

C-15

18

1.69, s

25.7, CH3

—

C-15

19

1.01, d (6.5)

18.0, CH3

H-1

C-1, C-2, C-9

20

1.11, d (7.0)

23.0, CH3

H-6

C-5, C-6, C-7

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