Table 1. Structures of test compounds.
| Compound | Structure | Compound | Structure | 
| 1 | 
 | 6 | 
 | 
| 2 | 
 | 7 | 
 | 
| 3 | 
 | 8 | 
 | 
| 4 | 
 | 9 | 
 | 
| 5 | 
 | 10 | 
 |