| http://www.w3.org/ns/prov#value | - (a) a carbonyl group (???CO???); (b) a carboxyl group (???COO???); (c) a sulphone (???SO2???); (d) an alkene (???CH???C(R)???) where R may be for a straight chain alkyl group having for example 1 to about 20 carbon atoms, particularly 1 to about 12 carbon atoms, such as pentyl, decyl and dodecyl, a branched alkyl group having for example 3 to about 40 carbon atoms, particularly 3 to about 30 carbo
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