| #C | Coumarin (Pouchert) δc (ppm) CDCl3 | ACS-1 (Canuto) δc (ppm) CDCl3 | Current study δc (ppm) CDCl3 |
| 2 | 160.6 | 160.9 | 160.9 |
| 3 | 116.4 | 117.1 | 117.0 |
| 4 | 143.3 | 141.6 | 143.5 |
| 5 | 127.7 | 128.1 | 128.0 |
| 6 | 124.3 | 124.6 | 124.6 |
| 7 | 131.6 | 132.0 | 132.0 |
| 8 | 116.6 | 116.9 | 116.9 |
| 9 | 118.8 | 119.9 | 119.5 |
| 10 | 153.8 | 154.3 | 154.2 |