New open-chain and cyclic tetrapeptides, consisting of alpha-, beta(2)-, and beta(3)-amino-acid residues, as somatostatin mimics - A survey

Dieter Seebach, Estelle Dubost, Raveendra I Mathad, Bernhard Jaun, Michael Limbach, Markus Loeweneck, Oliver Floegel, James Gardiner, Stefania Capone, Albert K Beck, Hans Widmer, Daniel Langenegger, Dominique Monna, Daniel Hoyer