| abstract |
The present inventionn n n R 1 represents hydrogen or alkyl;n n n R 2 represents an unsubstituted or substituted heterocycle, orn n n R 2 represents unsubstituted or substituted aryl;n n n R 3 represents alkyl or halogen;n n n X represents a single bond or an alkanediyl group (optionally interrupted by one or more oxygen atoms or carbonyl groups or carbonyloxy groups)n n n Compounds of formula I in the form of free base or acid addition salts, methods for their preparation, and their use as medicaments are provided.n n n <Formula I> |