| 5-Hydroxy-3-methyl-1-phenyl-4-trifluoroacetylpyrazole |
| 4-trifluoroacetyl-3-methyl-1-phenyl-5-pyrazolone |
| 3-Methyl-1-phenyl-4-trifluoroacetyl-5-pyrazolone |
| 3-methyl-1-phenyl-4-trifluoroacetyl-2-pyrazolin- 5-one |
| 3-Methyl-1-phenyl-4-trifluoroacetyl-2-pyrazolin-5-one |
