prov:value
| - Y and Y??? each, independently of the other, are a hydrogen atom or a bromine atom, n and n??? each, independently of the other, is an integer of 0, 1, 2, 3, or 4, R1 and R1??? each, independently of the other, is an alkylene group, an arylene group, an arylalkylene group, or an alkylarylene group, provided that no oxygen atom creates a
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