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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