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.
尿素的杂环羰基衍
生物,其
化学式为##STR1## 其中R是杂环基; 当R.sub.1和R.sub.2与它们连接的氮原子一起取时,它们是
吗啡啶,
硫代
吗啡啶或含6-8个成员的含氮杂环环; 它们的制备方法和作为溶解胆石的药剂的用途。