4-苯基-1,2,4-三唑啉-3,5-二酮   、                                                                                      
3-[2-((1R,2R)-2-Hydroxy-2,6,6-trimethyl-cyclohexyl)-eth-(E)-ylidene]-dihydro-furan-2-one                                                                                                                                                                                              以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                                                        以32%的产率得到3-<2-<2(RS)-Hydroxy-2,6,6-trimethyl-1(RS)-cyclohexyl>-1(SR)-(4-oxa-5-oxocyclopentenyl)-ethyl>-4-phenyl-1,2,4-triazolidine-3,5-dione