prov:value
| - wherein Rf is defined above and Q is a divalent radical selected from --NH--, ##STR8## wherein R4 is selected from hydrogen, chlorine, bromine, Rf SO2, alkyl of 1-20 carbon atoms, alkenyl of 3 to 4 carbon atoms, aryl or aralkyl from 6 to 20 carbon atoms such as phenyl, naphthyl, 4-ethylphenyl, benzyl, and the like; R5 is selected from hydrogen, chlorine, and bromine, and R6 is selected from hydrog
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