| http://www.w3.org/ns/prov#value | - radical of from about 2 to 4 carbon atoms, and R1, R2 and R3 can be the same or different and are selected from halogen, alkoxy of from 1 to 6 carbon atoms, alkoxy alkoxy of from 2 to 5 carbon atoms and alkyl of from 1 to 3 carbon atoms, with the proviso that at least one of R1, R2 and R3 is a group other than an alkyl group.
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