An ergoline derivative of the formula I: ##STR1## wherein R.sub.1 represents hydrogen or a methyl group; R.sub.2 represents hydrogen or a halogen atom, a methyl, cyano or phenyl group or an alkylthio group having from 1 to about 4 carbon atoms; R.sub.3 represents a hydrocarbon group having from 1 to about 4 carbon atoms; R.sub.4 represents hydrogen, a phenyl group or a hydrocarbon group having from 1 to about 4 carbon atoms; wherein either (a) R.sub.6 and R.sub.7 represent a valence bond or hydrogen atoms and R.sub.8 represents a hydrogen atom or a methoxy group, or (b) R.sub.6 represents a hydrogen atom and R.sub.7 and R.sub.8 taken together represent a valence bond; W represents an oxygen atom or an imino group; A represents a group of the formula CHR.sub.5, CH.dbd.CR.sub.5 or CH.sub.2 CHR.sub.5 wherein R.sub.5 represents a hydrogen atom or an alkyl group having from 1 to about 4 carbon atoms; X represents an oxygen or sulphur atom or an imino group; and n is 0, 1 or 2; or a pharmaceutically acceptable salt thereof.
化合物I的埃哥林衍
生物:##STR1##其中R.sub.1代表氢或甲基基团;R.sub.2代表氢或卤原子、甲基、
氰基、苯基或具有1到约4个碳原子的烷基
硫基团;R.sub.3代表具有1到约4个碳原子的碳氢基团;R.sub.4代表氢、苯基或具有1到约4个碳原子的碳氢基团;其中,要么(a)R.sub.6和R.sub.7表示一个价键或氢原子,R.sub.8表示氢原子或甲氧基,要么(b)R.sub.6表示氢原子,R.sub.7和R.sub.8一起表示一个价键;W代表氧原子或
亚胺基团;A代表公式CHR.sub.5,CH.dbd.CR.sub.5或CH.sub.2 CHR.sub.5的基团,其中R.sub.5代表氢原子或具有1到约4个碳原子的烷基基团;X代表氧原子或
硫原子或
亚胺基团;n为0、1或2;或其药学上可接受的盐。