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τ -Methyltransferase: Ether Derivatives. -A series of title compounds of type (V), (VII), (X) or (XII) is prepared and tested as histamine H3 receptor antagonists. Some compounds such as (XII) have a relatively high HMT inhibitory potency and others such as (V), (VII) or (X) are potent histamine H3 receptor ligands. -(APELT, J.; GRASSMANN, S.; LIGNEAU, X.; PERTZ, H. H.; GANELLIN, C. R.; ARRANG, J.-M.; SCHWARTZ, J.-C.; SCHUNACK, W.; STARK*, H.; Pharmazie 60 (2005) 2, 97-106; Inst. Pharm. Chem., Johann Wolfgang Goethe-Univ., D-60439 Frankfurt/M., Germany; Eng.) -M. Bohle 22-144