| http://www.w3.org/ns/prov#value | - Preferably, when R2 is a halo-susbstituted phenyl group, R3 is other than a phenyl group substituted with a moiety bound to said phenyl group via a sulfur atom. [0042] In a preferred embodiment, R2 and R3 are independently selected from substituted or unsubstituted aryl and substituted or unsubstitued heteroaryl groups.
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