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(a) Structure of the AAAA·DDDD duplex. The melamine nitrogen atoms are represented as black dots, and R’s are the solubilizing groups. (b) Side and top views of the energy minimum structure of the AAAA·DDDD duplex (MMFFs with chloroform solvation). H-bonds are indicated by black dotted lines. The solubilizing groups and hydrogen atoms are omitted for clarity.
