Abstract The following alkylamides of ω-carboxyalkanoyldi-and tripeptides of the Ala-Pro or Ala-Ala-Pro sequence have been prepared: ethylamide-, propylamide-, and isobutylamide of 3-carboxypropionylalanyl-proline, ethylamide of 3-carboxypropionylalanyl-alanyl-proline and ethylamide-, propylamide, and isobutylamide of 4-carboxybutyrylalanyl-alanyl-proline. The inhibitors were synthesized by fragment condensation in solution or by gradual ...