Gnrh antagonists being modified in positions 5 and6

摘要

Peptides are provided which have improved duration of GnRH antagonistic properties. These antagonists may be used to regulate fertility and to treat steroid-dependent tumors and for other short-term and long-term treatment indications. These antagonists have a derivative of aminoPhe or its equivalent in the 5- or the 5- and 6-positions. This derivative is modified so as to contain a carbamoyl group or heterocycle, including a urea moiety, in its side chain. Decapeptides having the formula:wherein Q2 is Cbm or MeCbm and Xaa10 is D-Ala-ol or Ala-ol are particularly effective and continue to exhibit very substantial suppression of LH secretion at 96 hours following injection.