摘要 |
The present invention relates to the use of compounds of the general Formula (1): wherein in Formula (1), R is H, alkyl, cycloalkyl, aryl or heteroaryl; R<SUP>1 </SUP>is H, alkyl, cycloalkyl, aryl or heteroaryl; R<SUP>2 </SUP>is H, alkyl, cycloalkyl, aryl or heteroaryl; A<SUP>1 </SUP>and A<SUP>2 </SUP>each independently represent an optionally substituted C<SUB>1</SUB>-C<SUB>20</SUB>-alkyl group which may contain one or more group(s) Z, or a monocyclic or polycyclic optionally substituted aromatic or non-aromatic ring system which may contain one or more group(s) X, and in case of a polycyclic ring system, said system contains at least one aromatic ring; Z is selected from the group consisting of S, O, N, NR<SUP>4</SUP>, CO, CO<SUB>2</SUB>, CS, SO or SO<SUB>2 </SUB>X is selected from the group consisting of S, O, N, NR<SUP>4</SUP>, SO or SO<SUB>2</SUB>.
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