Synthesis and biological activity of endomorphin-2 analogs incorporating piperidine-2-, 3- or 4-carboxylic acids instead of proline in position 2

1. Staniszewska, R.
2. Fichna, J.
3. Gach, K.
4. Toth, G.
5. Poels, J.
6. Vanden Broeck, J.
7. Janecka, A.