| http://www.w3.org/ns/prov#value | - ? or ???COO???; R and R??? independently denote ???H, ???F or a linear or branched alkyl group having 1-20 carbon atoms capable of including one methylene group which can be replaced with ???O???, ???S???, ???CH???CH??? or ???C???C???; and m and n are an integer of 1-8, with the proviso that R and R??? cannot be ???H at the same time when X and X??? are a single bond. 3.
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