N-(tert-butoxycarbonyl)-N-(tert-butoxycarbonyloxy)-3-oxo-4-phenylbutyramide

N-hydroxy-3-oxo-4-phenylbutanamide

N-benzyloxy-3-oxo-4-phenylbutanamide

6-benzyl-2,2-dimethyl-1,3-dioxin-4-one

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