| http://www.w3.org/ns/prov#value | - Accordingly, the present invention provides a compound of Formula I [0013] wherein, W is a nitrogen atom and Y is absent or, W is a carbon atom and Y=H; [0014] R1 to R7 may be the same or different and are independently selected from hydrogen or straight, branched or cyclic C1-6 alkyl; [0015] R8 is a substituted heterocyclic group or a substituted aromatic group [0016] Ar is an aromatic or heteroa
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