| http://www.w3.org/ns/prov#value | - r alkyl), NH???CO-(lower alkyl) or CF3, or R1 and R2 may together form a bond; and Y is a five or six membered ring system selected from the group consisting of: wherein Z is N, O or S, and said ring system is optionally substituted with one or more functional groups selected from the group consisting of NH2, NO2, OH, lower alkyl, lower alkoxy, halogen, CF3 and aryl (i.e., optionally substituted p
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