| abstract |
The present invention provides compounds of formula (I) and pharmaceutically acceptable salts thereof, wherein R 1 is hydrogen or fluorine, one of A and B is R2, and the other is -X-Y-R3 group. R3 represents a carbocyclic or heterocyclic ring. Further variables are defined in the specification. Also claimed are their preparation steps, pharmaceutical compositions containing them, and their use in the treatment of diseases such as schizophrenia, cognitive impairment and pain by modulation of D-amino acid oxidase enzyme (DAAO). |