new cns active peptides with effect on the cholinergic system.

摘要

The invention relates to peptides of the formula I R4-A5-A6-A7 (I) in which R4 denotes an acyl group, R5 denotes D-Lys or Lys, A6 denotes the radical of phenylalanine, N-methylphenylalanine, 4- alkoxyphenylalanine or 1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid, and R7 denotes a basic radical, processes for their preparation and their use.