Thiazolo[3,4-b]isoquinoline derivatives of the formula: ##STR1## wherein X.sub.1 represents hydrogen, halogen, methoxy or cyano, X.sub.2 represents hydrogen, halogen or methoxy, or X.sub.1 and X.sub.2 together represent methylenedioxy, and Y.sub.1 and Y.sub.2 each represent hydrogen, halogen, alkyl of 1 through 4 carbon atoms, alkoxy of 1 through 4 carbon atoms, alkylthio of 1 through 4 carbon atoms, hydroxy, amino or diacetylamino, are new compounds useful as anti-ulcer agents.
Thiazolo[3,4-b]
异喹啉衍
生物的
化学式为:##STR1## 其中,X.sub.1代表氢、卤素、甲氧基或
氰基,X.sub.2代表氢、卤素或甲氧基,或X.sub.1和X.sub.2一起代表甲二氧基,Y.sub.1和Y.sub.2分别代表氢、卤素、1到4个碳原子的烷基、1到4个碳原子的烷氧基、1到4个碳原子的烷
硫基、羟基、
氨基或二乙酰胺基。这些新化合物可用作抗溃疡剂。