4-甲基-2-(甲基氨基)-1,3-噻唑-5-羧酸

DL-4-氯-3-羟基丁酸乙酯

2-甲基-4-噻唑乙酸

ethyl 2-chloro-2-[(3-chlorophenyl)hydrazinylidene]acetate

ethyl 4-acetyloxy-3-oxobutanoate