| 摘要 |
<p>The invention relates to a novel compound of the formula <IMAGE> (I) and the pharmaceuticlly acceptable acid addition salts thereof, wherein R stands for a hydrogen atom or methyl group, x y designates a <IMAGE> Q is a hydrogen atom or a benzyloxycarbonyl- or N-tert.-butyloxycarbonyl protective group, and R1 is the side chain of a natural alpha -amino acid selected from the group consisting of Arg-, Tryp-13 , Phe-, Ser-, Leu-, Val-, Meth-, Tyr-, His- or Prol--side-chain.</p> |
