21-acetoxy-10β-ethynyl-11β-formyloxy-17α-hydroxy-19-norpregn-4-ene-3,20-dione                                                                                                                                                              在
                                                                                                                                                                                 
氢氧化钾                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
甲醇                                                                                  为溶剂,
                                                                                                                                                    反应 6.0h,
                                                                                                                生成                                                 (8S,9S,10R,11S,13S,14S,17R)-10-Ethynyl-11,17-dihydroxy-17-(2-hydroxy-acetyl)-13-methyl-1,2,6,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-cyclopenta[a]phenanthren-3-one