| α-MSH | Ac-Ser-Tyr-Ser-Met-Glu-His6-Phe7-Arg8-Trp9-Gly-Lys-Pro-Val-NH2 |
| NDP-MSH | Ac-Ser-Tyr-Ser-Nle-Glu-His-D-Phe-Arg-Trp-Gly-Lys-Pro-Val-NH2 |
| LK-184 (1) | Ph(CH2)3CO-His-D-Phe-Arg-Trp-NH2 |
| LK-394 (2) | Ph(CH2)3CO-His-D-Phe-Arg-NH2 |
| Compounds 3–32 | RCO-His-D-Phe-Arg-NH2 |