Compounds of formula (I)
wherein R1 is
as well as pharmaceutically acceptable salts, hydrates and/or enantiomers thereof are useful as compounds that exhibit activity at metabotropic glutamate receptors.
式(I)的化合物,其中R1为,以及其药学上可接受的盐、
水合物和/或对映体,可用作表现出代谢型谷
氨酸受体活性的化合物。