A cyclic tetrapeptide with inhibitory activity toward cell adhesion, cyclo(-Arg-Gly-Asp-Phg-) (phg, phenylglycine) (IC50 = 10-mu-M), was synthesized. The cyclization-cleavage of the protected precursor from the oxime resin significantly depended on the sequences of the linear tetrapeptides assembled by solid-phase-synthesis on the resin.