| Comp. | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| X | CH3 | CH(CH3)2 | Br | NO2 | COOH | COOH | COOH | COOCH3 | COOCH3 | COOCH3 |
| Y | COOCH3 | COOCH3 | COOCH3 | p-NO2-Ph | COOCH3 | C6H5 | p-NO2-Ph | p-NO2-Ph | COOCH3 | C6H5 |
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