What are disclosed are a nonapeptide of the formula ##STR1## wherein D-Aad (OBu.sup.t) represents D-.alpha.-aminoadipic acid .delta.-tert. butyl ester, methods for making this peptide, pharmaceutical preparations containing this peptide, and methods for its use in increasing fertility or for contraception.
                            披露了一种非肽九肽的公式##STR1##其中D-Aad(OBu.sup.t)代表D-.alpha.-
氨基
己二酸.三级丁基酯,制备该肽的方法,含有该肽的药物制剂,以及用于增加生育能力或避孕的方法。