Table 2.
13C NMR chemical shifts (δ, 50 MHz) for stevioside aglycon (1, D2O), steviol (2, CDQ3) and isosteviol (3, CDQ3).
| C | Stevioside (1) | Steviol (2) | Isoesteviol (3) |
|---|---|---|---|
| 1 | 40.7 | 40.6 | 40.0 |
| 2 | 19.0 | 19.0 | 19.2 |
| 3 | 38.1 | 37.8 | 37.3 |
| 4 | 44.1 | 43.6 | 43.6 |
| 5 | 57.2 | 56.9 | 57.0 |
| 6 | 21.8 | 21.8 | 21.9 |
| 7 | 41.5 | 41.3 | 41.6 |
| 8 | 42.5 | 41.7 | 48.7 |
| 9 | 53.6 | 53.8 | 54.7 |
| 10 | 39.6 | 39.5 | 38.2 |
| 11 | 20.4 | 20.5 | 20.3 |
| 12 | 36.1 | 39.3 | 38.2 |
| 13 | 85.8 | 80.4 | 39.5 |
| 14 | 44.1 | 47.4 | 54.3 |
| 15 | 47.2 | 47.0 | 48.6 |
| 16 | 153.8 | 155.9 | 222.6 |
| 17 | 104.2 | 103.0 | 19.9 |
| 18 | 28.1 | 28.8 | 29.3 |
| 19 | 176.8 | 182.3 | 180.5 |
| 20 | 15.1 | 15.5 | 13.5 |