Heterocyclylcarbonyl derivatives of urea having the formula ##STR1## wherein R is a heterocyclyl group; and R.sub.1 and R.sub.2 when taken together with the nitrogen to which they are attached are morpholino, thiomorpholino or a 6-8 membered nitrogen containing heterocyclic ring; methods for their preparation and use as agents for dissolving gallstones.
具有以下结构式的
脲的杂环羰基衍
生物##STR1##其中R是一个杂环基团;当R.sub.1和R.sub.2与它们附着的氮原子一起取代时,它们是
吗啡啶基、
硫代
吗啡啶基或含有6-8个成员的氮杂环环;其制备方法以及作为溶解胆结石的药剂的用途。