2-methylidenepent-4-enoic acid

2-亚甲基-4-戊烯酸甲酯

methyl 2-((dimethylamino)methyl)pent-4-enoate

2-(methoxycarbonyl)-N,N,N-trimethylpent-4-en-1-aminium iodide

ethyl (Z)-2-methyl-6-methylthio-4,6-dioxohex-2-enoate