| http://www.w3.org/ns/prov#value | - The carboxylic groups are provided by unsaturated mono- or dicarboxylic acid monomers such as those conforming to the formula (A l ): iii which n is an integer from 0 to 10, A 1 denotes a methylene group optionally joined to the carbon atom of the unsaturated group or to the adjacent methylene group when n is greater than 1 , via a heteroatom such as oxygen or sulphur, R7 denotes a hydrogen atom o
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