56580-46-2
3-bromo-4-oxobutyric acid ethyl ester
+
17356-08-0
aminothioamide
→
~71%
62557-32-8
2-(2-氨基噻唑-5-基)乙酸乙酯
5472-38-8
甲酸基丁二酸二乙酯
10138-10-0
4-氧代丁酸乙基酯
14794-31-1
丁二酸单乙酯酰氯