| abstract |
A compound of formula (IA) or the pharmaceutically acceptable acid addition salts thereof wherein: R1, R2, R3, R4 and R5 are the same or different and represent hydrogen, halogen, C1-C6alkyl, C1-C4alkoxy, C1-C4alkylthio, hydroxy, amino, mono(C1-C6) alkylamino, di(C1-C6)alkylamino, cyano, nitro, trifluoromethyl or trifluoromethoxy; R6 is hydrogen or C1-C6alkyl; W is nitrogen, COH, or CH; Y and Z independently represent nitrogen or CH; and A represents an alkylene group of from 2-5 carbon atoms optionally substituted with one or more alkyl groups having from one to four carbon atoms. The compounds of the invention demonstrate high affinity and selectivity in binding to the D4 receptor subtype. |