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

2,2-dimethyl-1,3-dioxane-4,5,6-trione

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

(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl) benzoate

1-phenyl-2H-pyrrol-3-one