3-benzyl 5-ethyl 6-(chloromethyl)-4-(2,4-dichlorophenyl)-2-methyl-1,4-dihydropyridine-3,5-dicarboxylate

(Z)-ethyl 4-chloro-2-(2,4-dichlorobenzylidene)-3-oxobutanoate

benzyl-β-aminocrotonate

2.4-二氯苯甲醛

4-氯乙酰乙酸乙酯