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(A) Chemical structure of NCSi-gb, formed by the postactivated NCS-chrom under basic conditions. (B) Chemical structure of NCSi-glu in presence of a thiol agent. (C) Induced formation of a DNA bulge structure (PDB ID: 1KVH) by binding of NCSi-gb on the DNA major groove. (D) Complex structure (PDB ID: 1MP7) of a DNA duplex bound by NCSi-glu.
