A compound of formula ##STR151## wherein the R.sup.1 is polycycloalkyl a is selected from the group consisting of ##STR152## wherein W, X, Y, and Z are each independently hydrogen, a straight or branched alkyl of from one to six carbon atoms, CF.sub.3, NR.sup.5 R.sup.6, --(CH.sub.2).sub.n CO.sub.2 R*, CN, F, Cl, Br, OR*, SR*, wherein , R*, R.sup.5, and R.sup.6 are each independently hydrogen or a straight or branched alkyl of from 1to about 6 carbon atcs and w is an integer of from 1to 3 and
- Ar.sup.1 is phenyl,
- pyrrolidinyl,
- substituted pyrrolidinyl,
- heterocycle,
- 2- or 3-thienyl,
- 2- or 3-furanyl,
- 2-, 3- or 4-pyridinyl, ##STR153## wherein E' and F are each independently hydrogen, fluorine, chlorine, bromine, iodine, methyl, methoxy, trifluoromethyl, nitro, hydroxy, NH.sub.2, and OCF.sub.3.