[Product name]: dexamethasone 
[Chemical name]: 9-fluoro-11β，17,21-trihydroxy-l6α-methylpregna-l,4-dime-3,20-dione,
[Product category]：corticosteroids
[CAS NO.] 50-02-2
[molecular formula]: C22H29FO5
[molecular weight]: 392.5
[Packing specification]: 1KG/tin
Quality:  CP/EP/USP/BP  
Specifications: 1KG/tin 
[Appearance]: white or almost white crystalline powder, odorless 
[Identification]: it should be positive 
[Melting point]: 254℃~264℃, decomposition while melting 
[specific rotation]: +72°～+82°
[absorptive index]: 380～410
[related substance]: max impurity≤1.0%， total impurities≤2.0%
[loss on drying]: ≤0.5%
[residue on ignition]: ≤0.2%
[assay]: calculated on the dried basis， C22H29FO5 should be 97.0%～102.0% 
[storage]: store in a airtight container，protected from light， 
[chemical formulation]: