(E)-2-(2,4-dioxooxazolidin-5-ylidene)-2-phenylacetaldehyde

5-(2-hydroxy-1-phenylethylidene)-2,4-oxazolidinedione

methyl (Z)-2-(dimethylamino)-3-phenylpenta-2,4-dienoate

4-dimethylamino-4-methoxycarbonyl-3-phenylbuta-1,3-diene