The invention relates to a polypeptide of formula I:-
wherein each of the generic terms is disclosed in full in the specification and includes:-R1 is (2-6C)alkanoyl or (1-4C)alkoxycarbonyl; A1 is a direct link to A2, or is Gly or Arg; A2 is a direct link to A3, or is Gly or Pro; A3 is a direct link to A4, or is Lys or Lys(Z); A4 is His or D-His; A5 is Trp or MeTrp; A6 is Ala or MeAla; A7 is Val or MeVal; A8 is Gly or Sar; A9 is His or MeHis; and Q is a group of the formula -A10.R2 in which A10 is Leu or D-Leu and R2 is hydroxy, amino, (1-3C)alkylamino or (1-3C)alkoxy; or Q is (1-6C)alkoxy or (1-10C)-alkylamino;
provided that when R1 is acetyl and -A4-A5-A6-A7-A8-A9-Q is -His-Trp-Ala-Val-Gly-His-Leu-NH2 then -A1-A2-A3- is not a direct link to His.
The compounds possess antagonist properties against bombesin-like peptides and are of value in the treatment of malignant disease in warm-blooded animals.
本发明涉及式 I 的
多肽
其中各通式在说明书中已全部公开,包括-R1是(2-6C)烷酰基或(1-4C)烷氧羰基;A1是与A2的直接连接,或者是Gly或Arg;A2是与A3的直接连接,或者是Gly或Pro;A3是与A4的直接连接,或者是Lys或Lys(Z);A4 是 His 或 D-His;A5 是 Trp 或 MeTrp;A6 是 Ala 或 MeAla;A7 是 Val 或 MeVal;A8 是 Gly 或 Sar;A9 是 His 或 MeHis;以及 Q 是式 -A10 的基团。其中 A10 是 Leu 或 D-Leu,R2 是羟基、
氨基、(1-3C)烷基
氨基或(1-3C)烷氧基;或 Q 是(1-6C)烷氧基或(1-10C)-烷基
氨基;
条件是当 R1 为乙酰基且-A4-A5-A6-A7-A8-A9-Q 为-His-Trp-Ala-Val-Gly-His-Leu-NH2 时,-A1-A2-A3- 不是与 His 的直接连接。
这些化合物具有拮抗蚕豆蛋白样肽的特性,在治疗温血动物的恶性疾病方面具有重要价值。