prov:value
| - In addition, the above formula encompasses dimeric materials containing two moieties of the formula [0047] linked by a central X moiety, as follows: [0048] wherein Y and Y??? each, independently of the other, is 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 or an
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