| http://www.w3.org/ns/prov#value | - hydrogen atom or an alkyl, aryl or aralkyl group containing 1 to 20 carbon atoms and X is a chlorine, bromine or iodine atom); R.sup.3--C.sub.6H.sub.4--SO.sub.2X (in the above formula, R.sup.3 is a hydrogen atom or an alkyl, aryl or aralkyl group
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