| abstract |
The invention relates to compounds of formula I n n n Where R 1 , L, R 2 , R 3 , R 4 and Y are as defined in the specification, or a pharmaceutically acceptable salt or acid addition salt thereof, a racemic mixture or the corresponding enantiomer And / or optical isomers and / or stereoisomers.n n n These compounds are useful in the treatment of Parkinson's disease, anxiety, vomiting, obsessive-compulsive disorder, autism, neuroprotection, cancer, depression, and type 2 diabetes. |