Table 2. IRa values of ligands (PBD1, PBD2, and TMPyP4) with the G-quadruplex DNA.
| Ratio of Quadruplex∶Ligand | IRa (Relative binding affinity) |
| Q:PBD1 (1∶1) | 0.45 |
| Q:PBD2 (1∶1) | 0.67 |
| Q:TMPyP4 (1∶1) | 0.18 |
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