| http://www.w3.org/ns/prov#value | - In still other preferred embodiments, R2 is substituted phenyl having from 1 to 3 substituents independently selected from halogen, cyano, nitro, ???OCF3, ???OH, ???O(C1-C6)alkyl, ???CF3, (C1-C8)alkyl. [0053] In a particularly preferred embodiment of the invention, Ar1 is a substituted or unsubstituted 2-benzothiazolyl group; X is ???O??? or ???NH???; Y is ???NH???S(O)2???; [0054] R1 is hydrogen,
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