11-beta,21-二羟基孕甾-1,4,17(20)-三烯-3-酮 、 11beta,21-Dihydroxy-6alpha-methylpregna-1,4,17(20)-trien-3-one 、 、 、 反应 120.0h,
以11β,21-dihydroxypregna-4,17(20)-dien-3-one 21-hemisuccinate potassium salt at a concentration of 5.0 g/l and medium 1, the desired Δ1,4 -product was produced in 100% yield after 5 days (Example 8)的产率得到(8S,9S,10R,11S,13S,14S,17Z)-11-羟基-17-(2-羟基乙亚基)-10,13-二甲基-2,6,7,8,9,11,12,14,15,16-十氢-1H-环戊二烯并[a]菲-3-酮