乙酸酐   、                                                                                      
(2R,3S)-3-Methoxycarbonyl-2-((1S,4aS,8aS)-5,5,8a-trimethyl-2-oxo-decahydro-naphthalen-1-ylmethoxy)-pentanedioic acid dimethyl ester                                                                                                                                                              在
                                                                                                                                                                                 
吡啶   、                                                                                                  lithium aluminium tetrahydride                                                                                                                                  作用下,
                                                                                                                                                                                                                            生成                                                 Acetic acid (2R,3R)-5-acetoxy-3-acetoxymethyl-2-((1S,4aS,8aS)-5,5,8a-trimethyl-2-methylene-decahydro-naphthalen-1-ylmethoxy)-pentyl ester