Pyrazolone

3-pyrazolone

5-pyrazolone

Pyrazolone, a five-membered-ring lactam, is a derivative of pyrazole that has an additional keto (=O) group. It has a molecular formula of C₃H₄N₂O. There are three possible isomers: 3-pyrazolone, 4-pyrazolone, and 5-pyrazolone.

Examples of derivatives include:

• Ampyrone, a pharmaceutical
• Metamizole, a pharmaceutical used as an analgesic, antispasmodic, antipyretic
• Pigment Yellow 10, a yellow colorant
• Phenidone, a dihydropyrazolone

External links

• Pyrazolones at the US National Library of Medicine Medical Subject Headings (MeSH)
• Pubchem - 3-Pyrazolone
• Pubchem - 5-Pyrazolone