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CD spectra of thiophene containing DB compounds (A) DB1463, (B) DB1438, and (C) DB1450 with Tel24 quadruplex sequence. Single strand quadruplex concentration is 4–5 µM. Filled circles represent free Tel24. The arrow indicates increasing ratio (0:1 to 10:1) of ligand to Tel24 until no further change in ICD is observed.
