| Compounds | R |
| 2a | 2-Methylpiperidinyl |
| 2b | 4-Methylpiperazinyl |
| 2c | 4-Phenylpiperazinyl |
| 2d | 1-(4-Methoxyphenyl)piperazinyl |
| 2e | 4-Methoxyphenoxy |
| 2f | 4-Methoxyphenylthio |
| 2g | 4-Fluorophenoxy |
| 2h | 4-Fluorophenylthio |
| 2i | imidazolyl |
| 2j | triazolyl |
| 2k | 4-Chlorophenylthio |
| 2l | 4-Benzylpiperidinyl |
| 2m | 4-(2-Dimethylaminoethyl)piperazinyl |
| 2n | 4-(3-Dimethylaminopropyl)piperazinyl |
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