The invention provides a compound of formula (I) or a salt or solvate thereof: (I) wherein R1 to R8, X and Ar are as defined in the specification, and uses of such compounds. The compounds inhibit GlyT1 transporters and are useful in the treatment of certain neurological and neuropsychiatric disorders, including schizophrenia.
[EN] PIPERIDINE DERIVATIVES AND THEIR USE AS GLYCINE TRANSPORTER INHIBITORS<br/>[FR] COMPOSES