Abstract:
Compounds of the structure ##STR1## wherein W is selected from ##STR2## where Q is oxygen or sulfur, R. sup. 6 and R. sup. 7 are hydrogen or alkyl, or R. sup. 6 and R. sup. 7, together with the nitrogen atoms to which they are attached, define a radical of formula ##STR3## R. sup. 8 is selected from hydrogen, alkyl, haloalkyl, optionally substituted phenyl, hydroxyalkyl, aminoalkyl, carboxyalkyl, (alkoxycarbonyl)alkyl, and (alkylaminocarbonyl)alkyl; Z is --CH. sub. 2 --, oxygen, sulfur, or --NR. sup. 9 where R. sup. 9 is hydrogen or alkyl, L. sup. 1 and L. sup. 2 are selected from a valence bond, alkylene, propenylene, and propynylene, R. sup. 1, R. sup. 2, R. sup. 3, and R. sup. 4 are independently selected from alkyl, haloalkyl, halogen, cyano, amino, alkoxycarbonyl, and dialkylaminocarbonyl, Y is selected from oxygen, --NR. sup. 10, where R. sup.