| 摘要 |
Novel phosphorylated nonapeptides having the formula <IMAGE> (I) wherein A represents L- or D-alanine, B, C and D represent Gly or D-alanine and R1 and R2 represent hydrogen or alkyl, AND DERIVATIVES OF COMPOUNDS OF FORMULA I, wherein one or more of the amide groups is N-alkylated and/or the end amino group is acylated or mono- or dialkylated and/or at least one carboxy group of L-Asp and L-Glu is esterified, amidated or mono- or dialkylamidated or reduced to a hydroxymethyl group, wherein the hydroxy group may optionally again be acylated, phosphorylated or alkylated are disclosed. These compounds are useful in pharmaceutical compositions as sleep inducing agents. Processes for the preparation of said nonapeptides are also disclosed.
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