| http://www.w3.org/ns/prov#value | - nyl group having 1 to 20 carbon atoms, etc.), an alicyclic hydrocarbon group (a cycloalkyl group, a cycloalkenyl group, etc.) or an aromatic hydrocarbon group (a phenyl group, a biphenyl group, etc.), and X and Y may be the same or different, provided that the case where both X and Y are a hydrogen atom is excluded.
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