4-(2,5-DIMETHOXY-PHENYL)-3-OXO-BUTYRIC ACID ETHYL ESTER

3-OXO-4-(3-TRIFLUOROMETHYL-PHENYL)-BUTYRIC ACID ETHYL ESTER

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

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

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