methyl 4-oxo-4-piperidin-1-ylbutanoate

methyl 4-oxo-6-trimethylsilylhex-5-ynoate

methyl 3-(2-but-3-enyl-1,3-dioxolan-2-yl)propanoate

4-羟基丁酸甲酯

methyl 4-[2-(1H-indol-3-yl)ethylamino]-4-oxobutanoate