摘要:
A compound of the formula wherein R¹ is a saturated or unsaturated alkyl group having 1-5 carbon atoms or a phenylalkyl group, whereby the phenyl ring may be substituted or unsubstituted and the alkyl having 1-4 carbon atoms, R² is hydrogen or an alkyl group having 1-5 carbon atoms, or R¹ and R² together form a 5- or 6-membered ring containing 1 or 2 heteroatoms selected from N, O and S, and enantiomers and physiologically acceptable salts thereof, processes for preparation of said compounds, pharmaceutical preparations containing said compounds, use of and method of treatment of disorders in CNS by using said compounds and intermediates.