disclosed are compounds of the formula ## str1 ## or the pharmaceutically acceptable salts thereof wherein the 6 - membered a ring may be optionally substituted with up to four groups independently selected from halogen , hydroxy , lower alkyl , or lower alkoxy ; ar represents optionally substituted aryl or heteroaryl z represents carbon or nitrogen provided that where z is carbon , r 11 represents hydrogen , halogen , hydroxy , lower alkyl , or lower alkoxy , or phenyl optionally substituted with one or two groups selected from hydrogen , halogen , hydroxy , lower alkyl , or lower alkoxy ; and where z is nitrogen , r 11 represents an electron pair ; r 5 is hydrogen or lower alkyl ; l and m represent integers ; n is 0 , or an integer ; r 12 and r 13 independently represent lower alkyl ; or together may together form an optionally substituted 5 - 11 membered ring with the nitrogen atoms to which they are bonded ; cr &# 39 ; r &# 34 ; represents a methylene group optionally substituted with lower alkyl ; and k is an integer of from 1 to 3 , which compounds are useful in treating various neuropsychochological disorders including , for example , schizophrenia , dementia , depression , anxiety , parkinson - like motor disorders and motion disorders related to the use of neuroleptic agents .