| http://www.w3.org/ns/prov#value | - If the hydrocarbon is a branched structure having substituent(s) thereon, then the substitution may be on either the hydrocarbon backbone or on the branch; alternatively the substitutions may be on the hydrocarbon backbone and on the branch. [0031] Preferably the hydrocarbon group contains from 1 to 10, preferably from 2 to 8, preferably 2 to 6, for example 2, 4 or 6 carbon atoms.
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