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Most of the G-quadruplex interactive molecules reported to date contain extended aromatic flat ring systems and are believed to bind principally by π–π stacking on the end G-tetrads of the quadruplex structure. One such molecule, TMPyP4, (5,10,15,20-tetra(N-methyl-4-pyridyl)porphyrin), exhibits high affinity and some selectivity for G-quadruplex DNA over duplex DNA. Although not a realistic drug candidate,...
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