| http://www.w3.org/ns/prov#value | - ##STR27## in which X represents F, Cl or Br, R.sup.3 is a single bond, S or O, n is an integer from 1 to 7 and R.sup.4 a C.sub.1 to C.sub.4 alkyl group, a benzyl group or a group of the formula: ##STR28## in which R.sup.5 is F, Cl, Br, I, NO.sub.2 or the
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