isopropylidene MeldruM's acid

2,2-Dimethyl-5-isopropylidene-1,3-dioxane-4,6-dione

5-Isopropylidene-2,2-dimethyl-[1,3]dioxane-4,6-dione

2,2-diMethyl-5-propan-2-ylidene-1,3-dioxane-4,6-dione

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