Four previously reported kinin receptor peptide antagonists, including the B1 receptor- selective peptides desArg10-HOE 140 (Hd-Arg-Arg-Pro-Hyp-Gly-Thi-Ser-d-Tic-Oic-OH) and B-9858 (H-Lys-Lys-Arg-Pro-Hyp-Gly-Igl-Ser-d-Igl-Oic-OH), have been modified by replacement of the central tetrapeptide Pro-Hyp-Gly-Xaa with linear alkyl spacers of variable length. The analogue of desArg10-HOE 140 containing the 11-aminoundecanoic acid as ...