| abstract |
There are provided ergoline derivatives of the formula: <IMAGE> I wherein R1 represents a hydrogen atom or a methyl group, R2 represents a hydrogen or halogen atom or a methyl group, R3 represents a hydrogen atom or a methoxy group, R4 represents a hydrocarbon group having from 1 to 4 carbon atoms; each of X and W independently represents a hydrogen atom, a methyl group, a chlorine atom or a methoxy group, and n is 0, 1 or 2. A method for their preparation is also provided. The compounds have strong antiprolactin activity. |