4,4′-[Carbonylbis(iminobenzene-4,1-diyloxy)]bis(N-methylpyridine-2-carboxamide); 4,4'-(((Carbonylbis(azanediyl))bis(4,1-phenylene))bis(oxy))bis(N-methylpicolinamide); 4,4'-[Carbonylbis(imino-4,1-phenyleneoxy)]bis[N-methyl-2-pyridinecarboxamide]; 4,4'-[Carbonylbis(iminobenzene-4,1-diyloxy)]bis(N-methylpyridine-2-carboxamide); N,N’-Bis{4-[2-(N-methylcarbamoyl)-4-pyridyloxy]phenyl}urea