Compounds of the formula I: ##STR00001##
or pharmaceutically acceptable salts thereof,
wherein m, p, q, Ar, R.sup.1 and R.sup.2 are as defined herein. Also provided are methods for preparing, compositions comprising, and methods for using compounds of formula I.

Compounds of the formula I: ##STR00001##
or pharmaceutically acceptable salts thereof,
wherein m, p, q, Ar, R.sup.1 and R.sup.2 are as defined herein. Also provided are methods for preparing, compositions comprising, and methods for using compounds of formula I.