Compounds which potentiate AMPA receptor and uses thereof in medicine

Compound of formula (I) and salts thereof are provided: wherein X, Y, Z, R1, R2 and R3 are as defined in the specification. Processes for preparation, pharmaceutical compositions, and uses thereof as a medicament, for example in the treatment of a disease or condition mediated by a reduction or imbalance in glutamate receptor function, such as schizophrenia or cognition impairment, are also disclosed.