| http://www.w3.org/ns/prov#value | - hydrogen, halogen, alkyl having from 1 to 10 carbon atoms orhalogenated alkyl of from 1 to 10 carbon atoms, R.sub.9, R.sub.10, R.sub.11, R.sub.12, R.sub.13 and R.sub.14 each independently is hydrogen, alkyl having from 1 to 10 carbon atoms or aryl having from 6 to 10 carbon atoms, Z.sub.1 and Z.sub.2 eachindependently is a moiety including an acid group, a, m and n each independently is 0 or 1, b,
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