| http://www.w3.org/ns/prov#value | - The group represented by R6 is preferably an alkyl group having from 1 to 16 carbon atoms, especially from 1 to 10 carbon atoms; an alkoxy carbonyl group, an alkyl carbonyl group or an N-substituted carbamoyl group each having from 2 to 16 carbon atoms, especially from 2 to 10 carbon atoms; or an aryl carbonyl group having from 6 to 16 carbon atoms, especially from 6 to 10 carbon atoms.
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