申请人:Takeda Chemical Industries, Ltd
公开号:US04277394A1
公开(公告)日:1981-07-07
Novel tetrapeptidehydrazide derivatives, inclusive of a pharmacologically acceptable acid addition salt thereof, which has the general formula (I): ##STR1## [wherein R.sub.1 is hydrogen or lower alkyl; R.sub.2 is hydrogen or the side chain of a D-.alpha.-amino acid; R.sub.3 is hydrogen or lower alkyl; R.sub.4 is hydrogen, or a saturated or unsaturated and straight or branched lower aliphatic acyl group which may optionally be substituted by hydroxy, amino, lower alkoxy, halogen, oxo, lower alkylthio or lower alkylthiooxide], are useful as analgesics.
具有以下一般式(I)的新型四肽酸酐衍生物,包括其药学上可接受的酸盐: ##STR1## [其中R.sub.1是氢或低级烷基;R.sub.2是氢或D-.alpha.-氨基酸的侧链;R.sub.3是氢或低级烷基;R.sub.4是氢,或饱和或不饱和的直链或支链低级脂肪酰基,该基团可以选择性地被羟基,氨基,低级烷氧基,卤素,氧代,低级烷硫基或低级烷硫氧化物取代],可用作镇痛剂。