| widely | 3 | degree |
| along with the acylating agents | 2 | other |
| further | 2 | degree |
| catalyst → be → studied | 16 |
| catalyst → be used in → this study | 11 |
| catalyst → be → investigated | 7 |
| catalyst → be → compared | 6 |
| catalyst → be → analyzed | 4 |
| catalyst → be → evaluated | 3 |
| negative | neutral | positive |
| 0.058 | 0.807 | 0.135 |
| Raw frequency | 47 |
| Normalized frequency | 0.643 |
| Modifier score | 0.450 |
| Perplexity | 167.469 |