prov:value
| - elected from the group consisting of a covalent bond, ##STR64## and combinations thereof, where r and r' are independently integers of 1 to about 20, s is independently an integer of 1 to about 10 for each (Cs H2s O), t is an integer of 1 to about 6, and p is an integer of 0 to about 4; ##STR65## where R' is selected from the group consisting of --Cl, --F, --CF3, --NO2, --CN, --H, ##STR66## where
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