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, R 1, R2 and R3 are as defined in the specification, processes for their preparation, pharmaceutical compositions containing them and their use in therapy.