The present invention relates to novel psycho-pharmacological active peptides and peptide derivatives of the formula: A-R-L-Ser-R.sub.1 -L-Thr-L-Pro-L-Leu-L-Val-L-Thr-B wherein R represents the amino acid residue L-Lys or L-Arg, R.sub.1 represents the amino acid residue L-Glu or L-Gln, B represents one of the following amino acid or peptide-radicals: L-Leu-OH, (.alpha.-dehydro)Leu-OH D-Leu-OH L-Leu-L-Phe-OH L-Leu-L-Phe-L-Lys-OH L-MeLeu-OH or the radical ##STR1## and A represents one of the following radicals or residues: hydrogen H-L-Glu Z.sub.1 -L-Glu Z.sub.2 -L-Ser-L-Glu- H-Q.sub.1 -L-Thr-L-Ser-L-Glu- Q.sub.2 -L-Thr-L-Ser-L-Glu- Z.sub.3 -Q.sub.1 -L-Thr-L-Ser-L-Glu- or H.sub.2 N-ALK-CO-L-Phe-Q.sub.1 -L-Thr-L-Ser-L-Glu- in which Z.sub.1 represents H-L-Ser, H-D-Ser, desamino-Ser, 2,3-dihydroxy propanoyl or H.sub.2 N-ALK-CO-, Z.sub.2 represents H-L-Thr, H-D-Thr, desamino-Thr, 2,3-dihydroxybutanoyl or H.sub.2 N-ALK-CO; Q.sub.1 represents L-Met, L-Met(O), L-Met (O.sub.2) or L-Leu Q.sub.2 represents H-D-Met, H-D-Met (O), H-D-Leu, H-D-Met (O.sub.2), desamino Met, desamino Met (O), desamino Met (O.sub.2), desamino Leu, 2-hydroxy-4-methylthiobutanoyl, 2-hydroxy-4-methylpentanoyl or the radical H.sub.2 N-ALK-CO, Z.sub.3 represents H-L-Phe, H-D-Phe, desamino Phe, 2-hydroxy-3-phenyl-propanoyl and H.sub.2 N-ALK-CO-, and ALK represents an alkylene or alkylidene group with 1-6 carbon atoms, as well as the functional derivatives thereof.
本发明涉及公式为A-R-L-Ser-R.sub.1-L-Thr-L-Pro-L-Leu-L-Val-L-Thr-B的新型精神药理活性肽和肽衍
生物,其中R代表
氨基酸残基L-Lys或L-Arg,R.sub.1代表
氨基酸残基L-Glu或L-Gln,B代表以下
氨基酸或肽基团之一:L-Leu-OH,(.alpha.-去
氢)Leu-OH,D-Leu-OH,L-Leu-L-Phe-OH,L-Leu-L-Phe-L-Lys-OH,L-MeLeu-OH或基团##
STR1##,A代表以下基团或残基之一:
氢H-L-Glu,Z.sub.1-L-Glu,Z.sub.2-L-Ser-L-Glu-H-Q.sub.1-L-Thr-L-Ser-L-Glu-Q.sub.2-L-Thr-L-Ser-L-Glu-Z.sub.3-Q.sub.1-L-Thr-L-Ser-L-Glu-或H.sub.2N-ALK-CO-L-Phe-Q.sub.1-L-Thr-L-Ser-L-Glu-,其中Z.sub.1代表H-L-Ser,H-D-Ser,去
氨基-Ser,2,3-二羟基丙酰或H.sub.2N-ALK-CO-,Z.sub.2代表H-L-Thr,H-D-Thr,去
氨基-Thr,2,3-二羟基丁酰或H.sub.2N-ALK-CO;Q.sub.1代表L-Met,L-Met(O),L-Met(O.sub.2)或L-Leu,Q.sub.2代表H-D-Met,H-D-Met(O),H-D-Leu,H-D-Met(O.sub.2),去
氨基Met,去
氨基Met(O),去
氨基Met(O.sub.2),去
氨基Leu,2-羟基-4-
甲基硫丁酰基,2-羟基-4-
甲基戊酰基或基团H.sub.2N-ALK-CO,Z.sub.3代表H-L-Phe,H-D-Phe,去
氨基Phe,2-羟基-3-
苯基-丙酰基和H.sub.2N-ALK-CO-,ALK代表具有1-6个
碳原子的烷基或烷基
亚胺基团,以及其功能衍
生物。