| http://www.w3.org/ns/prov#value | - integer ranging from about 2 to about 10 and R.sub.5 is O, NR.sub.6 or C(O), and wherein R.sub.6 is hydrogen, alkyl or aryl. More preferably, the amido alkyl group is of the structure --C(O)NH(CH.sub.2).sub.nN(H)--, wherein n is an integer ranging from
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