| http://www.w3.org/ns/prov#value | - wherein R4 is hydrogen or a hydrocarbon group having from 1 to 6 carbon atoms, R5 is a hydrocarbon group having from 1 to 5 carbon atoms, an alkoxyalkyl group having from 1 to 5 carbon atoms or an acyl group having from 1 to 4 carbon atoms, and c is an integer from 0 to 2.
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