| http://www.w3.org/ns/prov#value | - chosen from among radicals complying with the formulas: ##STR7## 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 is a C.sub.1 to C.sub.4 alkyl radical, a benzyl radical or the radical of
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