| http://www.w3.org/ns/prov#value | - In this formula (IX), A preferably, or in particular, has the meaning which has alreadybeen given in connection with the description of the compounds of the formula (I) according to the invention as being preferred, or particularly preferred, for A. R.sup.1 and R.sup.2 are identical or different and represent alkyl, preferably methyl,ethyl, n- or i-propyl or n-, i-, s- or t-butyl, or together with
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