The present invention provides compounds of formula I, ##STR1## wherein R.sub.1 is hydrogen; alkyl of 1 to 5 carbon atoms; cycloalkyl of 5 to 7 carbon atoms; alkyl of 1 to 4 carbon atoms mono-substituted by cycloalkyl of 3 to 7 carbon atoms; phenylalkyl of 7 to 11 carbon atoms in the aggregate thereof, wherein the phenyl ring is unsubstituted or mono-substituted by halogen of atomic number from 9 to 35, alkyl of 1 to 4 carbon atoms; or alkoxy of 1 to 4 carbon atoms; alkenyl of 3 to 5 carbon atoms, wherein the multiple bond is other than in the .alpha.,.beta. position; or 2-hydroxyethyl, and R.sub.2 is hydrogen or alkyl of 1 to 4 carbon atoms, having GABA-like activity.
本发明提供了式I的化合物,其中R1是氢;1至5个碳原子的烷基;5至7个碳原子的环烷基;1至4个碳原子的烷基,其单取代为3至7个碳原子的环烷基;其总计为7至11个碳原子的苯基烷基,其中苯环未取代或单取代为原子序数为9至35的卤素,1至4个碳原子的烷基或1至4个碳原子的烷氧基;3至5个碳原子的烯基,其中多重键不在α,β位置;或2-羟乙基,R2是氢或1至4个碳原子的烷基,具有类似
GABA的活性。