21-acetoxy-9α-bromo-11β-hydroxy-6α,16β-dimethyl-17α-propionyloxy-4-pregnene-3,20-dione 生成 [(6S,8S,10R,11S,13S,14S,16S,17R)-17-(2-acetyloxyacetyl)-11-hydroxy-6,10,13,16-tetramethyl-3-oxo-2,6,7,8,9,11,12,14,15,16-decahydro-1H-cyclopenta[a]phenanthren-17-yl] propanoate