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Structures of the two tetrakis-quaternary ammonium scaffolds A (1,2,4,5-tetrakis-{5-[1-(ammonium)-pent-1-ynyl}benzene) and B (1,2,4,5-tetrakis-{5-[1-(ammonium)-pentyl}benzene); TETRAKIS-1 scaffold A, NR3 = 3-benzylpyridinium; TETRAKIS-2 scaffold A, NR3 = quinolinium; TETRAKIS-3 scaffold B, NR3 = 3-(3-hydroxypropyl)-pyridinium.
