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  1 H and 13 C NMR spectral assignments of 1,1′- (((ethane-1,2-diylbis(oxy))bi..

1 H and 13 C NMR spectral assignments of 1,1′- (((ethane-1,2-diylbis(oxy))bis(4,1-phenylene)) bis(methylene))-bispyridinium and -bisquinolinium bromide derivatives