| http://www.w3.org/ns/prov#value | - R1 is a hydrogen atom, or a linear, branched, or cyclic alkyl group having 1-18 carbons atoms, preferably a hydrogen atom, or a linear, branched, or cyclic alkyl group having 1-12 carbon atoms, more preferably a hydrogen atom, or a linear, branched or cyclic alkyl group having 1-8 carbon atoms.
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