ethyl 3-benzamidocrotonate

5-(1-benzoylaminoethylidene)-2,2-dimethyl-1,3-dioxane-4,6-dione

(4-methyl-5-oxo-2-phenyl-4,5-dihydro-oxazol-4-yl)-acetic acid ethyl ester

3-benzoylamino-crotonic acid