DETAILED DESCRIPTION I claim: 1. A compound having the structure: ##STR279## wherein R. sub. 1 is C. sub. 1 -C. sub. 4 alkyl; R. sub. 2 is C. sub. 1 -C. sub. 4 alkyl or C. sub. 3 -C. sub. 6 cycloalkyl; and when R. sub. 1 and R. sub. 2 are taken together with the carbon to which they are attached they may represent C. sub. 3 -C. sub. 6 cycloalkyl optionally substituted with methyl; A is COOR. sub. 3, CONHR. sub. 6, CHO, CH. sub. 2 CH, COCH. sub. 3, COC. sub. 6 H. sub. 5, CN, CH. sub. 3, CN. dbd. NOH, CH. sub. 2 COOH, CONHOH, CH. sub. 2 CH. sub. 2 COOH, CHR. sub. 8 OH, ##STR280## R. sub. 3 is hydrogen, ##STR281## C. sub. 1 -C. sub. 12 alkyl optionally substituted with one of the following groups: C. sub. 1 -C. sub. 3 alkoxy, halogen, hydroxyl, C. sub. 3 -C. sub. 6 cycloalkyl, benzyloxy, furyl, phenyl, halophenyl, loweralkylphenyl, loweralkoxyphenyl, nitrophenyl, carboxyl, loweralkoxycarbonyl, cyano or triloweralkylammonium halide; C. sub. 3 -C. sub. 12 alkenyl optionally substituted with one of the following groups: C. sub. 1 -C. sub. 3 alkoxy, phenyl, halogen or loweralkoxycarbonyl or with two C. sub. 1 -C. sub. 3 alkoxy groups or two halogen groups; C. sub. 3 -C. sub. 6 cycloalkyl optionally substituted with one or two C. sub. 1 -C. sub. 3 alkyl groups; C. sub. 3 -C. sub. 6 alkynyl; or, A cation; R. sub. 6 is hydrogen, hydroxyl, C. sub. 3 -alkenyl, C. sub. 3 -alkynyl or C. sub. 1 -C. sub. 4 alkyl optionally substituted with one hydroxyl or one chlorine group; B is H, COR. sub. 4 or SO. sub. 2 R. sub. 5, provided that when B is COR. sub. 4 or SO. sub. 2 R. sub. 5, A is CH. sub. 3, CN, or COOR. sub. 3 in which R. sub. 3 is other than H or a cation; W is O; and Y and Z are not alkylamino, hydroxyl, or hydroxylower alkyl; R. sub. 4 is C. sub. 1 -C. sub. 11 alkyl, chloromethyl or phenyl optionally, substituted with one chloro, one nitro or one methoxy group; R. sub. 5 is C. sub. 1 -C. sub. 4 alkyl or phenyl optionally substituted with one methyl group; W is O or S; R. sub. 8 is C. sub. 1 -C. sub. 4 -alkyl or phenyl; X is hydrogen, halogen, hydroxyl or methyl, with the proviso that when Y and Z are taken together to form a ring and YZ is represented by the structure: --(CH
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