A member of the class of pyrazoles in which one of the carbons of the pyrazole ring is substituted by an oxo group.
| Member | Definition | Role |
|---|
| 3-hydroxymethylantipyrine | A pyrazolone that is antipyrine in which one of the hydrogens of the 5-methyl group is substituted by a hydroxymethyl group. It is a metabolite of the analgesic drug, antipyrene. | 3-hydroxymethylantipyrine |
| 4-formylaminoantipyrine | A pyrazolone that is 1,2-dihydro-3H-pyrazol-3-one substituted by a formaylamino group at position 4, methyl groups at positions 1 and 5 and a phenyl group at position 2. It is a metabolite of aminophenazone. | 4-formylaminoantipyrine |
| aminopyrine | A pyrazolone that is 1,2-dihydro-3H-pyrazol-3-one substituted by a dimethylamino group at position 4, methyl groups at positions 1 and 5 and a phenyl group at position 2. It exhibits analgesic, anti-inflammatory, and antipyretic properties. | aminophenazone |
| ampyrone | A pyrazolone, a member of the class of pyrazoles that is antipyrine substituted at C-4 by an amino group. It is a metabolite of aminopyrine and of metamizole. | 4-aminoantipyrine |
| antipyrine | A pyrazolone derivative that is 1,2-dihydropyrazol-3-one substituted with methyl groups at N-1 and C-5 and with a phenyl group at N-2. | antipyrine |
| edaravone | A pyrazolone that is 2,4-dihydro-3H-pyrazol-3-one which is substituted at positions 2 and 5 by phenyl and methyl groups, respectively. | edaravone |
| propyphenazone | A pyrazolone derivative that is antipyrine substituted at C-4 by an isopropyl group. | propyphenazone |