| http://www.w3.org/ns/prov#value | - in which each of R13 and R14 independently is a monovalent group selected from the group consisting of hydrogen, alkyl, cycloalkyl, aryl, and heterocyclic groups, each of which, except for hydrogen, may be substituted or unsubstituted; each of R15 -R17, inclusive, independently is a monovalent group selected from the group consisting of alkyl, cycloalkyl, aryl, and heterocyclic groups, each of whi
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