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| Compound | R | Compound | R |
|---|---|---|---|
| C1 | Phenyl | C11 | 4-Fluorophenyl |
| C2 | Naphthalen-1-yl | C12 | 4-Chlorophenyl |
| C3 | Naphthalen-2-yl | C13 | 4-Bromophenyl |
| C4 | 2-Fluorophenyl | C14 | 4-Iodophenyl |
| C5 | 3-Methoxyphenyl | C15 | 4-(Methylthio)phenyl |
| C6 | 3-Benzyloxyphenyl | C16 | 4-Benzyloxyphenyl |
| C7 | 3-Chlorophenyl | C17 | 4-(Trifluoromethyl)phenyl |
| C8 | 3-Bromophenyl | C18 | 2,6-Difluorophenyl |
| C9 | p-Tolyl | C19 | 2-Furanyl |
| C10 | 4-Methoxyphenyl | C20 | 3,4-Dimethoxyphenyl |
