(3aR,6aR)-2,5-Dihydroxy-1,3a,4,6a-tetrahydro-pentalene-1,3,4,6-tetracarboxylic acid tetra-tert-butyl ester                                                                                                                                                              在
                                                                                                                                                                                 potassium hydride                                                                                                                                  作用下,
                                                                                                                                                                                                                            生成                                                 
(3aS,6aS)-1,4-Diallyl-2,5-dimethoxy-1,3a,4,6a-tetrahydro-pentalene-1,3,4,6-tetracarboxylic acid tetra-tert-butyl ester