The prerequisite for Y2-mediated biological activity was elaborated by
synthesizing analogs of neuropeptide Y (NPY) 1-4-Ahx-25-36. The findi
ng, that a pronounced hydrophobic segment is required in the C-termina
l segment for signal transduction led to the development of a Y2-selec
tive agonist, which contains cyclohexylalanine at position 30 and/or 3
1.