Table 1.
Substituents of 2-oxo-1, 2-dihydroquinoline- 4-carboxylic acid derivatives and their fluorescence activity ratio (FAR).
| Compounds | Structure | FAR | 
|---|---|---|
| 1 |  | 1.29 | 
| 2 |  | 1.43 | 
| 3 |  | 1.53 | 
| 4 |  | 1.23 | 
| 5 |  | 0.98 | 
| 6 |  | 0.77 | 
| 7 |  | 1.61 | 
| 8 |  | 0.8 | 
| 9 |  | 1.82 | 
| 10 |  | 3.64 | 
| 11 |  | 0.84 | 
| 12 |  | 1.24 | 
| 13 |  | 11.34 | 
| 14 |  | 28.7 | 
| 15 |  | 0.85 | 
| 16 |  | 0.87 | 
| 17 |  | 8.22 | 
| 18 |  | 224.7 |