| http://www.w3.org/ns/prov#value | - For example the cyclic structure in the formula (a-1) may have five substituents (alkyl group, cycloalkyl group or alkenyl group) at maximum as R.sub.1to R.sub.5.An alkyl group as R.sub.1 to R.sub.6 or Ra is a linear or branched alkyl group that may have a substituent.The linear or branched alkyl group is preferably a linear or branched alkyl group with 1 to 12 carbon atoms, more preferably a line
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