tetraethyl 3,3',3'',3'''-((3,3'-dimethyl-2,2'-spirobi[chromene]-8,8'-diyl)bis(azanetriyl))tetrapropionate                                                                                                                                                              在
                                                                                                                                                                                 
sodium hydroxide                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
四氢呋喃                                                                                  为溶剂,
                                                                                                                                                    反应 96.0h,
                                                                                                                以92.7%的产率得到3-[[8'-[Bis(2-carboxyethyl)amino]-3,3'-dimethyl-2,2'-spirobi[chromene]-8-yl]-(2-carboxyethyl)amino]propanoic acid