甲基5-(二甲基氨基)-2-亚甲基-5-噻吩基氧代戊酸酯

ethyl 2-(diethoxyphosphorylmethyl)prop-2-enoate

trimethyl but-3-ene-1,1,3-tricarboxylate

methyl 4-hydroxy-2-methylidenebutanoate