US Patent 7910556 PAR-2 agonist

A compound, or a salt or solvate thereof having a structure of Ar—CO-AA1-AA2-AA3-AA4-NH—X—NR1R2 is disclosed. Ar represents an optionally substituted phenyl group or an aromatic heterocyclic group; AA1 represents a hydrophobic amino acid; AA2 represents an unsubstituted amino acid containing 2 or more carbon atoms; AA3 represents an unsubstituted amino acid containing 2 or more carbon atoms; AA4 represents a hydrophobic amino acid; X represents a divalent saturated aliphatic hydrocarbon group having 2-6 carbon atoms; and R1 and R2 represent a saturated or unsubstituted aliphatic hydrocarbon group having 1-8 carbon atoms, or alternatively R1 and R2 may form a ring together with an adjacent nitrogen atom. A pharmaceutical composition for prevention/treatment of diseases associated with PAR-2 is also disclosed. The pharmaceutical composition includes the above compound, a salt or a solvate thereof and a pharmaceutically acceptable carrier.