| 1 | R = 4-OH | 7 | R = 2-OCH3, 5-Br |
| 2 | R = 4-NO2 | 8 | R = 3-OH, 4-OCH3 |
| 3 | R = 4-N(CH3)2 | 9 | R = 3-NO2 |
| 4 | R = 4-NH-CO-CH3 | 10 | R = 4-OH, 3-NO2 |
| 5 | R = 4-Br | 11 | R = 4-Cl, 3-NO2 |
| 6 | R = 2-OH, 5-Br |
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