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| Phenylbutazone |
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| 4-Butyl-1,2-diphenyl-3,5-pyrazolidinedione |
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| 50-33-9 |
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| Anti-inflammatory. |
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Crystals from ethanol, mp 105? Soly in water at 22.5? 0.7 mg/ml (also reported as 2.2 mg/ml). pK 4.5 (from uv in water), pK 4.89 (titration in 50% ethanol), pK 5.25 (titration in 80% 2-methoxyethanol). uv max (acid methanol): 239.5 nm (log e 4.19).
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