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Table 1 NMR data of compound 1 (500 MHz for 1H NMR and 125 MHz for 13C NMR, CD3OD)

From: A terpenoid isolated from sarang semut (Myrmecodia pendans) bulb and its potential for the inhibition and eradication of Streptococcus mutans biofilm

C Position

13C NMRδC (ppm)

DEPT 135°

1H –NMR δH (Int., mult., J = Hz)

HMBC 1H - 13C

COSY 1H - 1H

1

39.42

CH2

2.58 (2H)

2

27.0

CH2

1.29 (2H;s)

3

78.99

CH

3.19 (1H; t; J = 6.8)

4

44.5

Cq

5

35.45

CH

 

C-1, C-20

6

30.21

CH2

1.29 (2H;s)

7

40.57

CH2

2.41 (2H)

8

146.84

Cq

9

49.67

CH

1.98 (1H)

10

45.89

CH

1.98 (1H)

11

118.45

CH

4.85 (1H; t)

C-23, C-24

12

133.02

Cq

13

30.87

Cq

14

136.55

Cq

15

104.65

Cq

16

22.27

CH2

1.65 (2H; d; J = 9.1)

17

123.66

CH

4.92 (1H; t)

18

110.52

CH2

4.59 (1H; s); 4.37 (1H; s)

C-16

19

14.64

CH3

0.99 (3H; d; J = 3.9)

C-2, C-6

20

177.10

Cq

21

114.56

CH2

4.49 (2H; s)

C-8

22

18.00

CH3

1.48 (3H; s)

23

19.91

CH3

1.25 (3H, s)

C-14, C-27

24

17.11

CH3

1.52 (3H; d; J = 6.5)

C-12, C-22

25

12.96

CH3

1.25 (3H; d; J = 7.15)

C-27

H-26, H-27

26

34.19

CH2

1.98 (2H; m)

H-25

27

42.71

CH

2.56 (1H; m)

C-25

H-25

28

36.41

CH2

1.79 (2H; t; J = 7.48)

C-30

H-29

29

29.04

CH2

1.25 (2H; d; J = 7.15)

H-28

30

22.70

CH3

1.65 (3H; d; J = 9.1)

31

26.06

CH3

1.65 (3H; d; J = 9.1)

C-16

  1. 13C NMR: was used to determine the number of carbon signals.
  2. HMQC: was used to determine the number of proton signals
  3. DEPT 135°: was used to determine the number of methyl signals
  4. COSY: was used to examine the correlations between hydrogens
  5. HMBC: was used to determine the positions of functional groups and partial structures