2-benzyl-6,6-dimethyl-5,7-dioxaspiro[2.5]octane-4,8-dione

2,2-dimethyl-4,6-dioxo-5-(phenyl(piperidin-1-yl)methyl)-1,3-dioxan-5-ide

2,2-dimethyl-5-[phenyl(piperidin-1-yl)methyl]-1,3-dioxane-4,6-dione

5-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)-phenylmethyl]-2,2-dimethyl-1,3-dioxane-4,6-dione

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