The present invention is directed to a somatostatin antagonist according to formula (I), wherein A
1
is an optionally substituted aromatic ∝-amino acid; A
2
is an optionally substituted aromatic ∝-amino acid; A
3
is Dab, Dap, Lys or Orn; A
4
is &bgr;-Hydroxyvaline, Ser, Hser, or Thr; A
5
is an optionally substituted D- or L-aromatic -amino acid; and Y
1
is OH, NH
2
or NHR
1
, where R
1
is (C
1-6
)alkyl; wherein each said optionally substituted aromatic -amino acid is optionally substituted with one or more substituents each independently selected from the group consisting of halogen, NO
2
, OH, CN, (C
1-6
)alkyl, (c
2-6
)alkenyl, (c
2-6
)alkynyl, (C
1-6
)alkoxy, Bzl, O-Bzl, and NR
9
R
10
, where R
9
ad R
10
each is independently H, O, or (C
1-6
)alkyl; and wherein the amine nitrogen of each of amide peptide bond and the amino group of A
1
of formula (I) is optionally substituted with a methyl group, provided that there is at least one said methyl group; or a pharmaceutically acceptable salt thereof, and to uses thereof.
本发明涉及一种符合式(I)的体
生长抑素拮抗剂,其中 A
1
是任选取代的芳香族 ∝
氨基酸;A
2
是一种任选取代的芳香族 ∝-
氨基酸; A
3
是 Dab、Dap、Lys 或 Orn; A
4
是 &bgr;-羟基缬
氨酸、Ser、Hser 或 Thr;A
5
是任选取代的 D-或 L-芳香族-
氨基酸;以及 Y
1
是 OH、NH
2
或 NHR
1
其中 R
1
是(C
1-6
烷基;其中每个所述任选取代的芳香族 -
氨基酸任选被一个或多个取代基取代,这些取代基各自独立地选 自卤素、NO
2
、OH、CN、(C
1-6
烷基、(C
2-6
)烯基、(c
2-6
炔基、(C
1-6
烷氧基、Bzl、O-Bzl 和 NR
9
R
10
其中 R
9
为 R
10
各自独立地为 H、O 或 (C
1-6
烷基;其中每个酰胺肽键的胺氮和 A
1
或其药学上可接受的盐及其用途。