(2E,4E)-4-Methyl-5-((2R,3S,2'R,3'S)-3,2',3'-trimethyl-[2,2']bioxiranyl-3-yl)-penta-2,4-dienoic acid methyl ester   、                                                                                      
(2E,4E)-4-Methyl-5-((2R,3S,2'S,3'R)-3,2',3'-trimethyl-[2,2']bioxiranyl-3-yl)-penta-2,4-dienoic acid methyl ester                                                                                                                                                              在
                                                                                                                                                                                 
三氟乙酸                                                                                                                                  作用下,
                                                                                                                                                                                                                            以20%的产率得到(2E,4E)-5-((2R,3R,4R,5S)-3,4-Dihydroxy-2,4,5-trimethyl-tetrahydro-furan-2-yl)-4-methyl-penta-2,4-dienoic acid methyl ester