Aethyl-<-cinnamat, ethyl 4-(2-phthalimido)ethoxyacetoacetate, 4-<4-Aethoxy-benzylidenamino>-zimtsaeure-aethylester, ethyl 4-<4-ethoxybenzylideneamino>cinnamate, 4-(p-Aethoxy-benzylidenamino)-zimtsaeure-aethylester, 2-(phthalimido)ethoxy>acetoacetate, ethyl 4-[2-(1,3-dioxoisoindolin-2-yl)ethoxy]-3-oxobutanoate, p-ethoxy-benzylidene-p-amino-cinnamate d'ethyle, Ethyl 4-(2-(1,3-dihydro-1,3-dioxo-2H-isoindol-2-yl) ethoxy)-3-oxobutanoate, Ethyl4-[2-(1,3-Dioxo-1,3-Dihydro-2h-Isoindol-2-Yl)Ethoxyl]-3-Oxobutanoate, 4-Ethoxy-benzylidenamino>-zimtsaeure-ethylester, 4-[2-(1,3-dioxo-1,3-dihydro-isoindol-2-yl)-ethoxy]-3-oxo-butyric acid ethyl ester, 4-Aethoxybenzal-4-aminozimtsaeure-aethylester