| http://www.w3.org/ns/prov#value | - is hydrogen or independently selected from among the same substituents as R3, or R3 and R4 together form a heterocyclic nucleus forming a 5- or 6-membered ring, wherein the ring atoms are chosen from the class consisting of nitrogen, carbon, oxygen, sulfur, and selenium atoms; the alkyl moieties, except as otherwise noted, in each instance include from 1 to 6 carbon atoms and the cycloalkyl moiet
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