Phenylbutazone (Standard) is the standard substance of Phenylbutazone, and it is applicable for quantitative analysis, quality control, and related research in biochemical experiments. Phenylbutazone (Butazolidine) is a butyl-diphenyl-pyrazolidinedione that has anti-inflammatory, antipyretic, and analgesic activities. It has been used in ankylosing spondylitis, rheumatoid arthritis, and reactive arthritis.