| http://www.w3.org/ns/prov#value | - The alkyl group represented by R is preferably one having 1 to 32 carbon atoms, the alkenyl group and the alkinyl group are preferably those having 2 to 32 carbon atoms, and the cycloalkyl group and the cycloalkenyl group are preferably those having 3 to 12, particularly 5 to 7, carbon atoms, the alkyl, alkenyl and alkinyl groups each including those having a straight or branched chain.
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