英文别名Betamethasone Impurity 4; ethyl (2-((8S,9R,10S,11S,13S,14S,16S,17R)-9-fluoro-11,17-dihydroxy-10,13,16-trimethyl-3-oxo-6,7,8,9,10,11,12,13,14,15,16,17-dodecahydro-3H-cyclopenta[a]phenanthren-17-yl)-2-oxoethyl) carbonate; Betamethasone impurity D; Betamethasone 21-(ethyl carbonate); 9-Fluoro-11β,17-dihydroxy-16β-methyl-3,20-dioxopregna-1,4-dien-21-yl ethoxycarboxylate; Pregna-1,4-diene-3,20-dione, 21-[(ethoxycarbonyl)oxy]-9-fluoro-11,17-dihydroxy-16-methyl-, (11β,16β)-; ethyl [2-[(8S,9R,10S,11S,13S,14S,16S,17R)-9-fluoro-11,17-dihydroxy-10,13,16-trimethyl-3-oxo-6,7,8,11,12,14,15,16-octahydrocyclopenta[a]phenanthren-17-yl]-2-oxoethyl] carbonate 
