Refers to the relative positions of the aryl groups in the polymer chain, where they are connected at the 1st and 3rd carbon atoms of the methylene linkage
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<(3-Bromo-4,6-dimethylphenyl)bis(4-tert-butylphenyl)methoxy>methane
4,6-dibromo-α,α-α',α'-tetramethyl-1,3-benzenedimethanol
