Compuestos derivados de piridazinona sustituida; compuesto intermediario; composicion farmaceutica; combinacion farmaceutica; y uso en el tratamiento de la esquizofrenia, trastorno esquizoafectivo, trastornos cognitivos o dolor.

摘要

The present invention provides compounds of formula (I) and pharmaceutically acceptable salts thereof, wherein R1 and R2 are as defined in the specification, processes for their preparation, pharmaceutical compositions containing them and their use in therapy.