| http://www.w3.org/ns/prov#value | - sup.3, --CONHR.sup.3, --NR.sup.2.sub.2, and --OR.sup.3, all except H areoptionally substituted; or together with X forms a cyclic group including aryl, cyclic alkyl, and heterocyclic;R.sup.1 is independently selected from the group consisting of --H, alkyl, aryl, alicyclic where the cyclic moiety contains a carbonate or thiocarbonate, --C(R.sup.2).sub.2 -aryl, alkylaryl, --C(R .sup.2).sub.2 OC(O)N
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