abstract |
The description relates to a process for producing pentapeptides of the formula (I) in which A and R1-R3 have the meanings given, in which the pentapeptide is constructed in steps from a prolinamide of the formula (II) in which R?1 and R2¿ have the meanings given above, and the group -NR1R2 may be hydrolytically separated from the peptide thus obtained. |