Luteinizing hormone-releasing hormone. Antiovulatory activity of analogs substituted in positions 2 and 6

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Abstract
Ten analogs of luteinizing hormone-releasing hormone (LH-RH) substituted in position 2 with D-amino acids and at 6 with either a D-amino acid or a nonasymmetric amino acid were synthesized by solid-phase methodology and assayed for antiovulatory activity. [D-Phe2]-LH-RH substituted in the 6 position with D-Ala, D-Leu, D-Arg, D-(Ph)Gly, D-Phe, or 2-Me-Ala possessed varying degrees of antiovulatory activity. [D-p-F-Phe2-D-Ala6]-LH-RH was one of the most active antiovulatory compounds, while the [D-p-Cl-Phe2-D-Ala6]-LH-RH analog was devoid of activity at a comparable dose.

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