4-(2,3-二氯苯基)-2,6-二甲基-1,4-二氢吡啶-3,5-二羧酸二甲酯

methyl 2-(1,3-dithiolan-2-ylidene)-3-oxobutanoate

2-phenylpropan-2-yl 3-oxobutanoate

3-methylbut-2-enyl 2,2-dichloro-3-oxobutanoate

methyl 3-(4-methylanilino)but-2-enoate