PEPTIDE DERIVATIVES

摘要

Compounds represented by the following general formula and salts thereof: HN=C(R1)-X-Y-NH-CH(R2)-CO-Q, wherein R1 represents amino, etc.; R2 represents substituted benzyl, etc.; X represents a Pro residue, a substituted tyrosine residue, etc.; Y represents an alanine residue, etc.; and Q represents Nmethyl-.beta.-alanine, etc. Because of having an analgetic effect, the compounds are usable in the treatment of cancer pain, etc.