| http://www.w3.org/ns/prov#value | - In one aspect, R may be selected from the group consisting of methyl, ethyl, propyl, isopropyl, butyl, pentyl, hexyl, octyl, decyl, dodecyl, cycloalkyl, aryl especially phenyl, naphthyl, arylalkyl especially benzyl, phenylethyl, and combinations thereof.
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