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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 ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Pyrazolone」の詳細全文を読む スポンサード リンク
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