Abstract: The present invention relates to novel compounds of the following formula: ##STR1## individual isomers and pharmaceutically acceptable acid addition salts thereof, wherein R.sub.1 is hydrogen, alkyl or phenyl-lower alkyl, in which the phenyl group may be substituted with halogen, lower alkyl or lower alkoxy; R.sub.2 is alkyl, alkenyl, alkynyl or phenyl-lower alkyl, in which the phenyl group may be substituted with halogen, lower alkyl or lower alkoxy; and R.sub.4 is hydrogen or alkyl.The invention moreover relates to methods for the preparation of the compounds of formula I, to novel intermediates, to pharmaceutical compositions containing same and to methods for the treatment of disorders, caused by malfunction of the acetylcholine (AcCh) or muscarinic system, by administering a non-toxic effective amount of a compound of the formula I.

Abstract: The analgesic use of compounds of formula I ##STR1## wherein R is hydrogen, acetyl or a group of formula IIR'--O--CO-- IIwherein R' is alkyl (C.sub.1-8); phenyl; phenyl substituted in the 4-position with halogen, alkoxy(C.sub.1-4) or alkyl(C.sub.1-4); phenylalkyl; or phenylalkyl in which the phenyl group is substituted in the 4-position with halogen, alkoxy(C.sub.1-4) or alkyl (C.sub.1-4).