4-((2-chloroethoxy)methyl)-N-hydroxytetrahydro-2H-pyran-4-carboximidamide 、
丁炔二酸二乙酯 以gave 15.25 g (84% yield) of title material as light yellow oil after chromatography的产率得到diethyl 2-[(Z)-[amino-[4-(2-chloroethoxymethyl)oxan-4-yl]methylidene]amino]oxybut-2-enedioate