4,4'-diacetoxy-β,β-carotene

5,6,5',6'-diseco-β,β-carotene-4,6,4',6'-tetraone

5-(2-ethyl-[1,3]dioxolan-2-yl)-3,3-dimethyl-pentan-2-one

4-(2-ethyl-[1,3]dioxolan-2-yl)-2,2-dimethyl-butyric acid