Lrf antagonists

Details Lrf antagonists Lrf antagonists

C - Chemistry, Metallurgy

07

C

530/7.06

C07C 103/52 (1980.01)

Patent

CA 1186302

LRF ANTAGONISTS ABSTRACT 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, dehydro D-Pro, Thz or D-Thz; R2 is D-Phe, D-His, D-Trp, Trp, 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, CH3S-D-Phe, OCH3-D-Phe or CH3-D-Phe; R3 is D-Trp, Trp, D-Phe or D-His; R4 is Gly or a D-isomer amino acid; R5 is Leu or N.alpha.Me-Leu; and R6 is Gly-NH2 or NHCH2CH3.

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