Abstract: Peptide derivatives of the following general formula (I): ##STR1## wherein AAA is deletion or Ser, BBB is deletion or Glu, CCC is deletion, Ile, Phe, Leu, cyclohexylalanine, D-alle or Lys substituted at the .epsilon.-position by C.sub.6 --C.sub.18 alkylcarbonyl group, DDD is Gly or Gln, EEE is Leu, Nle or Phe, FFF is Met, Leu or Nle, GGG is Ala, Ser Leu, Asn, Asp or Gln, HHH is Leu, Glu or Lys, III is His, Lys or Arg, JJJ is His, Lys or Arg, Xaa is Ala modified at the carboxy terminal with an amino group, provided that CCC and DDD may independently be modified at the amino terminal by C.sub.2 --C.sub.

Abstract: The present invention relates to the peptides consisting of 25-50 amino acid residues and comprising the following peptide sequence:Leu-Met-His-Asn-Leu-Gly-Lys-Ser-Ile-Gln-Asp-Leu-Arg-Arg-Arg-Phe-Phe-Leu-His -His-Leu-Ile-Ala-Glu-Ile (I)and amides and salts thereof. The peptides have stronger inhibitory activity against hPTH when compared with conventional inhibitors, and therefore, they are expected to be useful for the treatment of various diseases associated with calcium or phosphoric acid metabolism such as hypercalcemia and osteoporosis, or diseases associated with PTH and PTHrP.

Abstract: Peptide derivatives of the following general formula (I): Seq. ID Nos. 1-6. ##STR1## wherein AAA is deletion or Ser, BBB is deletion or Glu, CCC is deletion, Ile, Phe, Leu, cyclohexylalanine, D-alle or Lys substituted at the .epsilon.-position by C.sub.6 -C.sub.18 alkylcarbonyl group, DDD is Gly or Gln, EEE is Leu, Nle or Phe, FFF is Met, Leu or Nle, GGG is Ala, Ser, Leu, Asn, Asp or Gln, HHH is Leu, Glu or Lys, III is His, Lys or Arg, JJJ is His, Lys or Arg, Xaa is Ala modified at the carboxy terminal with an amino group, provided that CCC and DDD may independently be modified at the amino terminal by C.sub.2 -C.sub.