| http://www.w3.org/ns/prov#value | - -a) wherein R6 is hydrogen, or [0293] a combination of a compound of the formula (A-1-a) with a compound of the formula (C-2-a) wherein R13 is methyl, or [0294] a combination of a compound of the formula (B-1-b) wherein E1 is hydrogen with a compound of the formula (C-1-a) wherein R6 is hydrogen. [0295] Component (II) is preferably a C2-C24carboxylate of Fe, Ce, Co, Mn, Cu or Vd, in particular Ce,
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