Chemical shift Coupling constanta 13C enrichment Position 13C δ (ppm) JCC (Hz) % 13Crel.b % 13C13C c             1 152.50 66.9  (6) 1.10 28.57     8.3  (4)     2 131.34 59.9  (3) 1.24 27.01 3 126.23 59.8  (2) 1.12 22.48     2.5  (9)     4 121.67 8.4  (1) 1.24 16.67 5 136.66 44.4  (10) 1.17 19.35 6 116.00 66.6  (1) 1.34 21.26 7 26.70 34.6  (8) 1.24 23.66  8/9 22.71 34.5  (7) 1.47 13.79     2.6  (3)     10 20.91 44.2  (5) 1.16 22.48 aThe numbers in parentheses indicate the coupling partners bThe signal with the lowest 13C enrichment is referenced to 1.10% 13C cFraction of the indexed coupling pair in the overall signal intensity of the respective 13C NMR signal

Table 2: 13C-NMR data of thymol obtained from T. transcaucasicus flowers labelled with 13CO2 for four hours and extracted with chloroform 12 days after the labelling pulse. The solvent was CDCl3.