<amino>methylene>propanedioic acid diethyl ester                                                                                                                                                              在
                                                                                                                                                                                 
硫酸   、                                                                                                  
乙酸酐                                                                                                                                  作用下,
                                                                                                                                                                                                                            生成                                                 2-[1-[Cyclopropyl-(6-oxo-5-trifluoromethyl-5,6-dihydro-pyridin-2-yl)-amino]-meth-(E)-ylidene]-malonic acid monoethyl ester   、                                                                                             2-[1-[(6-Chloro-5-trifluoromethyl-pyridin-2-yl)-cyclopropyl-amino]-meth-(E)-ylidene]-malonic acid monoethyl ester