prov:value
| - wherein each Y, independently of the others, is a hydrogen atom or a bromine atom, each n, independently of the others, is an integer of 0, 1, 2, 3, or 4, and each R1, independently of the others, is an alkylene group or an arylalkylene group, said moieties being linked by a central atom or group of atoms or bonded to a polymeric chain.
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