Isobutyric acid (1R,2S,5S,6R,7R,9R,10S,12S)-9,12-dihydroxy-1,5,9-trimethyl-4,13-dioxo-3-oxa-tricyclo[8.2.1.0
2,6]tridec-7-yl ester                                                                                                                                                              在
                                                                                                                                                                                 sodium tetrahydroborate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
吡啶   、                                                                                         
甲醇                                                                                  为溶剂,
                                                                                                                                                    反应 0.17h,
                                                                                                                生成                                                 
Isobutyric acid (1R,2S,5S,6R,7R,9R,10R,12S,13S)-12,13-diacetoxy-9-hydroxy-1,5,9-trimethyl-4-oxo-3-oxa-tricyclo[8.2.1.02,6]tridec-7-yl ester