Selectively BRS-3-agonistic compounds of formula I ##STR00001## wherein A.sup.1, A.sup.2, A.sup.3, R.sup.1, R.sup.2, R.sup.3, Ar.sup.1, Ar.sup.2, Ar.sup.3, m and n have the meanings given in the description, and also pharmaceutical compositions containing these compounds and a process for the preparation of compounds of Formula I are described.