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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http://en.wikipedia.org/wiki/Pyrazolone
(from the article `analgesic`) The pyrazolone analgesics (such as phenylbutazone) have effects similar to those of aspirin; they were commonly used to treat rheumatoid arthritis, ...
Found on
http://www.britannica.com/eb/a-z/p/137
A class of non-steroidal anti-inflammatory agents used in the treatment of arthritic conditions; e.g., phenylbutazone. ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973
Type: Term Pronunciation: pir′ă-zō′lōn Definitions: 1. A class of nonsteroidal anti-inflammatory agents used in the treatment of arthritic conditions; phenylbutazone.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=74464
any of the group of heterocyclic compounds containing the pyrazoline ring in which one carbon atom is doubly linked to an oxygen atom not in the ring. · the parent compound, CHNO.
Found on
https://www.infoplease.com/dictionary/pyrazolone
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