The invention relates to C to N cyclized (C-N cyclic) monomer and dimer peptide molecules, as well as peptide dimers which are connected by linker moieties at the N terminus and the C terminus of each peptide subunit, which inhibit binding of α4β7 to the mucosal addressin cell adhesion molecule (MAdCAM) in vivo, and show high selectivity against α4β1 binding.
