(S)-3-Hydroxy-3-methyl-5-((S)-2,5,5,8a-tetramethyl-3,4,4a,5,6,7,8,8a-octahydro-naphthalen-1-yl)-pentanoic acid methyl ester                                                                                                                                                              在
                                                                                                                                                                                 
chromium(VI) oxide   、                                                                                                  sodium tetrahydroborate   、                                                                                                  
硫酸                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
甲醇   、                                                                                         
丙酮                                                                                  为溶剂,
                                                                                                                                                    反应 3.0h,
                                                                                                                生成                                                 
(S)-3-Hydroxy-5-((S)-3-hydroxy-2,5,5,8a-tetramethyl-3,4,4a,5,6,7,8,8a-octahydro-naphthalen-1-yl)-3-methyl-pentanoic acid methyl ester