<1aS-(1aα,1bβ,5α,5aβ,6aα)> 1a,1b,2,3,5,5a,6,6a-octahydro-1b,5-dimethyl-6a-(1-methylethyl)cycloprop<α>inden-4(1H)-one   、                                                                                      
碘甲烷                                                                                                                                                              在
                                                                                                                                                                                 
potassium tert-butylate                                                                                                                                  作用下,
                                                                                                                                                                                                                            生成                                                 
<1aS-(1aα,1bβ,5aβ,6aα)> 1a,1b,2,3,5,5a,6,6a-octahydro-1b,5,5-trimethyl-6a-(1-methylethyl)cycloprop<α>inden-4(1H)-one