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(A) Guanine quadruplex structure adopted by TBA. In this study, T4 was substituted by W or K (X4). (B) Chemical structure of 5-(indolyl-3-acetyl-3-amino-1-propenyl)-2′-deoxyuridine (W). (C) Chemical structure of 5-(methyl-3-acetyl-3-amino-1-propenyl)-2′-deoxyuridine (K).
