The present invention relates to heterocyclic derivatives of formula I
wherein R
1
, R
2
and R
3
are as defined in the description and claims, which compounds are metabotropic glutamate receptor 5 antagonists.
本发明涉及公式I的杂环衍
生物,其中R1、R2和R3如描述和要求中所定义,这些化合物是代谢型谷
氨酸受体5拮抗剂。