prov:value
| - Preferred compounds employed in the invention include those in which R is a phenyl or naphthyl group or a phenyl grup substituted with one of the following: alkyl (1 to 8 carbons), chloro, bromo, o-hydroxy, alkoxy (1 to 10 carbons), carbethoxyalkoxy (4 to 13 carbons), cycloalkoxy (5 to 6 carbons), cyclopentylmethoxy, or cyclohexylmethoxy, or substituted twice as follows: dimethyl, dichloro, dibrom
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