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(a) Minor groove complex formation between DNA duplex and 8-ring cyclic Py/Im polyamide (conjugate 17, PDB ID# 3I5L) [76]; (b) Complex between DNA duplex and Hoechst 33258 (PDB ID# 8BNA) [82]; (c) Crystal complex between DNA duplex and pentamidine (PDB ID# 3EY0) [83].