trimethoxy-[3-[4-[1-(3-trimethoxysilylpropyl)pyridin-1-ium-4-yl]pyridin-1-ium-1-yl]propyl]silane,dibromide

1-ethyl-4-(1-hexadecylpyridin-1-ium-4-yl)pyridin-1-ium,dibromide

1-octyl-4-(1-octylpyridin-1-ium-4-yl)pyridin-1-ium

1-benzyl-4-pyridin-1-ium-4-ylpyridin-1-ium,dichloride

4-pyridin-4-ylpyridine-2-carboxylic acid