2-((3R,3aR,5R,8aR)-3-Hydroxy-3,8-dimethyl-6-oxo-1,2,3,3a,4,5,6,8a-octahydro-azulen-5-yl)-acrylic acid methyl ester                                                                                                                                                              在
                                                                                                                                                                                 sodium tetrahydroborate                                                                                                                                  作用下,
                                                                                                                                                                                                                            生成                                                 
2-((3R,3aR,5R,6S,8aR)-3,6-Dihydroxy-3,8-dimethyl-1,2,3,3a,4,5,6,8a-octahydro-azulen-5-yl)-acrylic acid methyl ester