| http://www.w3.org/ns/prov#value | - wherein in Formula II, R is suitably by optionally substituted alkyl preferably C1-20alkyl, particularly C1-10-alkyl substituted with one or more electron-withdrawing groups e.g. F or other halo, nitro, cyano, etc., with perfluoruoalkyl, particularly C1-10perfluoroalkyl being preferred; optionally substituted carbocyclic aryl such as phenyl or naphthyl; optionally substituted heteroaromatic or het
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