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(Science: chemical) 4-amino-1,5-dimethyl-2-phenyl-3h-pyrazolone. A metabolite of aminopyrine with analgesic and anti-inflammatory properties. It is used as a reagent for biochemical reactions producing peroxides or phenols. Ampyrone stimulates liver microsomes and is also used to measure extracellular water.

Pharmacological action: non-steroidal anti-inflammatory agents, indicators and reagents.

chemical name: 3H-Pyrazol-3-one, 4-amino-1,2-dihydro-1,5-dimethyl-2-phenyl-