Ethyl 2-[(dimethylamino)methylene]-3-oxobutanoateEthyl 2-[(dimethylamino)methylene]acetoacetateEthyl 2-[(dimethylamino)methylidene]-3-oxobutanoateEthyl 2-acetyl-3-(dimethylamino)acrylateEthyl 2-acetyl-3-(dimethylamino)acrylateethyl 2-[(dimethylamino)methylidene]-3-oxobutanoate2-Acetyl-3-dimethylaminoacrylic Acid Ethyl EsterEthyl 2-Dimethylaminomethylene-3-oxobutanoateEthyl 2-Dimethylaminomethylene-3-oxobutanoate2-[(Dimethylamino)methylene]-3-oxo-butanoic Acid Ethyl EsterEthyl 2-Acetyl-3-dimethylaminoacrylate