title: Antagonists of luteinizing hormone releasing hormone with novel unnatural amino acids at position six.
abstract: Five new antagonists of luteinizing hormone releasing hormone (LHRH) containing novel unnatural amino acids at position six are reported. They are very effective in the rat antiovulatory assay. Using saline as vehicle, antagonist-[N-Ac-D-2-Nal1, D-4-Cl-Phe2, D-3-Pal3, Arg5, D-A26, D-Ala10]-LHRH inhibited ovulation completely at 1 micrograms/rat and three of the other antagonists showed some antiovulatory activity at 0.5 micrograms/rat.
authors.affiliation: Institute of Polymer Chemistry, Nankai University, Tianjin, China.
authors.forename: K L
authors.initials: KL
authors.lastname: Liu
authors.forename: B L
authors.initials: BL
authors.lastname: He
authors.forename: S B
authors.initials: SB
authors.lastname: Xiao
authors.forename: Q M
authors.initials: QM
authors.lastname: Xia
authors.forename: X
authors.initials: X
authors.lastname: Fang
authors.forename: Z Y
authors.initials: ZY
authors.lastname: Wang
mesh_terms: D000596:Amino Acids / Q000032:analysis; D000818:Animals; D055598:Chemical Phenomena; D002621:Chemistry; D002850:Chromatography, Gel; D002851:Chromatography, High Pressure Liquid; D007987:Gonadotropin-Releasing Hormone / Q000037:antagonists & inhibitors*; D051381:Rats
chemical_list: D000596:Amino Acids; D007987:Gonadotropin-Releasing Hormone