The invention relates to the use of a N-benzyl 5-substituted imidazole derivative having the general formula (I) wherein R is (C1-3)alkyl, (C1-3)alkyloxy, halogen, nitro or cyano; R1 is formyl, (C1-6)alkyl, optionally substituted with OH, (C1-3)alkyloxy, (C1-3)alkylcarbonyloxy, (C1-3)alkyloxy- carbo
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