6-羟基-3-哒嗪甲酸

6-chloro-pyridazine-3-carboxylic acid butyl ester

5-chloropyrazine-2-carboxylic acid,chloride

6-氯哒嗪-3-甲酸甲酯

6-氯哒嗪-3-羧酸乙酯