6(S),19-(4-phenyl-3,5-dioxo-1,2,4-triazolidine-1,2-diyl)-3β-hydroxy-9,10-secoergosta-5(10),7(E),22(E)-triene                                                                                                                                                              在
                                                                                                                                                                                 
potassium tert-butylate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙醚   、                                                                                         
水                                                                                  为溶剂,
                                                                                                                                                    反应 2.0h,
                                                                                                                以85%的产率得到(1S,7S)-7-Hydroxy-1-[(1R,3aS,7aR)-7a-methyl-1-((E)-(1R,4R)-1,4,5-trimethyl-hex-2-enyl)-octahydro-inden-(4E)-ylidenemethyl]-3,4,5,6,7,8-hexahydro-1H-phthalazine-2-carboxylic acid phenylamide