| Compound | R1 | R2 | R3 | R4 |
| 1 | H | H | H | H |
| 2 | H | OCH3 | OCH3 | OCH3 |
| 3 | H | H | N(CH3)2 | H |
| 4 | H | H | Cl | H |
| 5 | H | OCH3 | OCH3 | H |
| 6 | H | H | OCH3 | H |
| 7 | H | H | F | H |
| 8 | Br | H | CH2CH(CH3)2 | H |
| 9 | Br | H | OCH3 | H |
| 10 | H | H | CH2CH(CH3)2 | H |