(E,2R,3S,7R,8Z)-8-[(8S,8aS)-8-hydroxy-8-methyl-1,2,3,5,7,8a-hexahydroindolizin-6-ylidene]-4,7-dimethyloct-4-ene-2,3-diol   、                                                                                      
丙酮                                                                                                                                                                                                                                                                                                          生成                                                 
(8S,8aS)-8-Methyl-6-[(E)-(R)-2-methyl-5-((4S,5R)-2,2,5-trimethyl-[1,3]dioxolan-4-yl)-hex-4-en-(Z)-ylidene]-octahydro-indolizin-8-ol