Dexamethasone sodium phosphate Chemicalname:9-fluoro-11β,17-dihydroxy-l6α-methyl-3,2Cdioxopregna-l,4-dien-2l-yl disodium phosphate Product category]： corticosteroids CAS NO. 2392-39-4 molecular formula: C22H28FNa2O8P [molecular weight]: 516.4 [Packing specification]: 1KG/tin [specification]: CP/EP/USP/BP [Approval No.]: Guo yao Zhun Zi H12020198 Quality specification CP2005 [Appearance]: white or light yellow powder, odorless，tasted bitter, hygroscopic [Identification]: it should be positive [specific rotation]: +72°～+80° [alkali value]: PH 7.5~10.5 [free state phosphate ]: light absorptive should be less than reference solution [clarity and color]: the solution should be colorless and clear. If not, it should not be more concentrated than standard solution; if color turns it should not be deeper than standard solution. [related substance]: dexamethasone≤0.5%, any other single impurity≤0.5%, other total impurities≤2.0%. [loss on drying]: ≤16.0% [residual solvent]: acetone ≤0.5%, methanol ≤0.3% [assay]: calculated on dried basis, C22H28FNa2O8P, should be 96.0%～102.0% [Storage]: protected from light, store in a airtight container and place in a dry place