The invention relates to cyclic urea derivatives of general formula ##STR1## wherein R.sub.a, R.sub.b, X and Y are as defined herein, pharmaceutical compositions containing the derivatives and processes for preparing them.
本发明涉及一般式为 ##STR1## 的环状
脲衍
生物,其中 R.sub.a,R.sub.b,X和Y的定义如本文所述,以及含有该衍
生物的药物组合物和制备它们的过程。