Chemical Name: 4-Butyl-1,2-diphenyl-3,5-pyrazolidinedione
CAS: 50-33-9
Structural formula:

Molecular formula: C₁₉H₂₀N₂O₂
Molecular weight: 308.38
Specification: State pharmaceutical inspection administration of PRC
Appearance: white or almost white crystalline powder, odorless and bitter taste
Melting point: 104-107^οC
Readily carbonizable substance: ≤0.10%
Loss on drying: Not more than 1.0%
Residue on ignition: Not more than 0.1%
Heavy metals: Not more than 0.00001%
Assay: ≥ 99%
Application: Anti-infectious analgesic. Used in rheumatism and rheumatoid arthritis and gout, etc