21-acetoxy-9α-fluoro-17α-hydroxy-16α-methyl-11β-trifluoroacetoxy-4-pregnene-3,20-dione 、
二甲醇缩甲醛 生成 [(8S,9R,10S,11S,13S,14S,16R,17R)-17-(2-acetyloxyacetyl)-9-fluoro-17-hydroxy-10,13,16-trimethyl-6-methylidene-3-oxo-2,7,8,11,12,14,15,16-octahydro-1H-cyclopenta[a]phenanthren-11-yl] 2,2,2-trifluoroacetate