3-(2-oxo-2-(pyrrolidin-1-yl)ethyl)pent-4-en-1-yl pivalate

3-vinylpentane-1,5-diol

3-(2-hydroxyethyl)pent-4-en-1-yl pivalate

methyl-3-(2-(pivaloyloxy)ethyl)pent-4-enoate

3-(2-acetoxyethyl)pent-4-enoic acid