Pyrazolone

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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 two possible isomers: 3-pyrazolone and 5-pyrazolone.

Examples of derivatives include:

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