| http://www.w3.org/ns/prov#value | - r iodine atom, X and Y, which can be the same or different, each is an oxygen or sulfur atom; Z is phenylazo or naphthylazo which is unsubstituted or substituted by one or more of halogen, hydroxyl, amino, alkyl, alkoxy, monoalkylamino, dialkylamino, COOH and SO3 H; alkyl, hydroxyalkyl, alkoxy and acyl unless otherwise indicated being up to 4 carbon atoms; with the proviso that R2 is CSR9 or COR11
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