Disclosed is a compound represented by Structural Formula (I):
##STR00001## R.sub.1 is a substituted or unsubstituted 2-imidazolyl
group which is optionally fused to a substituted or unsubstituted aryl
group. Z.sub.1 is .dbd.O, .dbd.S, .dbd.NOR.sub.11. R is represented by a
Structural Formula selected from (II) (VII): ##STR00002## The
variables in Structural Formulas (II) (VII) are described herein.