SUBSTITUTED CYCLOPENTANES, TETRAHYDROFURANES AND PYRROLIDINES AS OREXIN RECEPTOR ANTAGONISTS

摘要

The present invention provides compounds of formula (I) and pharmaceutically acceptable salts thereof, Formula (I) wherein L, X, Ra, Rb, R1, R2 and R3 are as defined in the specification, processes for their preparation, pharmaceutical compositions containing them and their use in therapy.;