| http://www.w3.org/ns/prov#value | - The aliphatic hydrocarbon group represented by RB2 is a normal chain, branching, or cyclic alkyl group (preferably having from 1 to 20 carbon atoms, more preferably having from 1 to 12 carbon atoms, and particularly preferably having from 1 to 8 carbon atoms, such as methyl, ethyl, isopropyl, tert-butyl, n-octyl, n-decyl, n-hexadecyl, cyclopropyl, cyclopentyl, and cyclohexyl), an alkenyl group (pr
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