| abstract |
Compounds of general Formula I are disclosed ##STR1## wherein R 1 is C 1-4 -alkyl, n R 3 is hydrogen, C 1-4 -alkyl, acyl, aryl, n R 5 is hydrogen, C 1-4 -alkyl, n X is oxygen, CH 2 or NR 4 with R 4 =hydrogen, C 1-4 -alkyl and n Y is an aromatic or nonaromatic ring system which can optionally contain one to two hetero atoms and can be substituted, and the stereoisomers and their mixtures, n as well as their preparation and use as medicinal agents. |