(3,11-dimethoxy-15,16-dihydro-cyclopenta[
a]phenanthren-17-yliden)-acetic acid ethyl ester                                                                                                                                                              在
                                                                                                                                                                                 palladium on activated charcoal   、                                                                                                  
乙醇                                                                                                                                  作用下,
                                                                                                                                                                                                200.0~220.0 ℃
                                                                                                                            、6.37 MPa
                                                                                条件下,
                                                                                                                                                    生成                                                 
(3,11-dimethoxy-16,17-dihydro-15H-cyclopenta[a]phenanthren-17-yl)-acetic acid ethyl ester