| http://www.w3.org/ns/prov#value | - however, that only one bond of this type can be present per molecule.Hal is preferably F, Cl or Br.It is generally the case that all radicals such as, for example, A, which can occur in the molecule several times, can be identical or different, i.e. independent of one another.Accordingly, the invention relates in particular to those compounds of the formula I in which at least one of the radicals
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