| http://www.w3.org/ns/prov#value | - bon atoms, e.g. methyl, ethyl, propyl, butyl, hexyl or octyl; however, in this case X preferably represents an alkyl group having from 1 to 4 carbon atoms,most especially a methyl group.When X represents an alkenyl group, it may be an alkenyl group having from 3 to 6 carbon atoms, e.g. allyl, 2-butenyl or 2-hexenyl
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