| http://www.w3.org/ns/prov#value | - The compound of claim 7, wherein each Ar is independently selected from the group consisting of 2,6-dimethylphenyl, o-tolyl and 4-{O???[(CH2)n???C(O)???O]mR}-2,6-dimethylphenyl, where n is an integer equal to 1 to 6, m is 0 or 1, and R is C1-C6 alkyl; and each W is independently selected from the group consisting of ???NH???C(O)???CH2???, ???NH???C(O)???C*H(CH3)??? and ???NH???C(O)???C*H(CH2CH3)??
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