N-prop-2-enylpent-4-enamide

[pent-4-enoyl(pent-3-en-2-yl)amino] acetate

[cyclohexen-1-ylmethyl(pent-4-enoyl)amino] acetate

N-hydroxy-N-prop-2-enylpent-4-enamide

[but-2-enyl(pent-4-enoyl)amino] acetate