methyl (4S,6R)-β-hydroxy-α,6-dimethyl-2-oxo-1,3-dioxane-4-pentanoate

methyl (4S,6R)-α,6-dimethyl-β,2-dioxo-1,3-dioxane-4-pentanoate

(4S,6R)-4-(3-butenyl)-6-methyl-1,3-dioxan-2-one