| http://www.w3.org/ns/prov#value | - (a) a straight alkyl chain having for example 1 to about 20 carbon atoms, particularly 1 to about 12 carbon atoms, such as pentyl, decyl and dodecyl; (b) a branched alkyl group having for example 3 to about 40 carbon atoms, particularly 3 to about 30 carbon atoms such as isopropyl, isopentyl and 2-propyl-pentyl; (c) a cycloalkyl group having for example 3 to about 30 carbon atoms, particularly 4 t
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