A synthetic steroid,C21H26O5,similar to cortisone that is used as an antiallergic,immunosuppressive,and anticancer drug and as an anti-inflammatory agent in the treatment of rheumatoid arthritis.

• 波尼松合成类固醇，C21H26O5，与用作抗过敏、免疫抑制和抗癌药，并在风湿性关节炎的治疗中作为消炎药的可体松相似。