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CAS号: 4735-65-3 英文名称: 9-Bromo-11,17,21-trihydroxy-16-methylpregna-1,4-diene-3,20-dione-21-acetate 英文同义词: Betamethasone Impurity 20;21-Acetoxy-9α-Bromo-11β,17α-dihydroxy-16β-methyl-pregna-1.4-dien-3.20-dion;9-Bromo-11,17,21-trihydroxy-16-methylpregna-1,4-diene-3,20-dione-21-acetate;Pregna-1,4-diene-3,20-dione, 21-(acetyloxy)-9-bromo-11,17-dihydroxy-16-methyl-, (11β,16β)- (9CI) 中文名称: 9Α-溴-16Β-甲基孕甾-1,4-二烯-11Β,17Α,21-三醇-3,20-二酮-21-醋酸酯 中文同义词: 倍他米松杂质20;9Α-溴-16Β-甲基孕甾-1,4-二烯-11Β,17Α,21-三醇-3,20-二酮-21-醋酸酯 分子式: C24H31BrO6 分子量: 0 熔点 : 140-142 °C (decomp)(Solv: acetone (67-64-1); ethyl ether (60-29-7)) 沸点 : 619.1±55.0 °C(Predicted) 密度 : 1.44±0.1 g/cm3(Predicted) 酸度系数(pKa): 12.12±0.70(Predicted)