| http://www.w3.org/ns/prov#value | - l and phenoxy moiety; and wherein E is an end group of the formula ##STR8## Y is a side chain of the same structure and configuration as said repeating unit; the substituents Br, E and Y on each phenyl ring are attached only to the ortho or para positions relative the hydroxyl group in the structural formula and the oxygen atom in the repeating unit; each t, p and q are independently the integer 0
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