| 摘要 |
Peptides which inhibit the secretion of gonadotropins by the pituitary gland and inhibit the release of steroids by the gonads. Administration of an effective amount prevents ovulation of female mammalian eggs and/or the release of steroids by the gonads. The peptides have the structure. X-R1-R2-R3-Ser-Tyr-R4-R5-Arg-Pro-R6 wherein X is hydrogen or an acyl group having 7 or less carbon atoms; R1 is dehydro Pro or dehydro D-Pro; R2 is D-Phe, Cl-D-Phe, dichloro-D-Phe, CF3-D-Phe, F-D-Phe, difluoro-D-Phe, AcNH-D-Phe, NO2-D-Phe, dinitro-D-Phe, Br-D-Phe, dibromo-D-Phe, CH3-S-D-Phe, OCH3-D-Phe or CH3-D-Phe; R3 is D-Trp or beta -(naphthyl)-D-Ala; R4 is a D-isomer aromatic amino acid or beta -(naphthyl)-D-Ala; R5 is Leu or N alpha Me-Leu; and R6 is Gly-NH2 or NHCH2CH3; provided however that either R3 or R4 is beta -(naphthyl)-D-Ala.
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