1PUY:
reference: Face-to-face and edge-to-face pi-pi interactions in a synthetic DNA hairpin with a stilbenediether linker., Egli M, Tereshko V, Mushudov GN, Sanishvili R, Liu X, Lewis FD, J Am Chem Soc 2003 Sep 10;125(36):10842-9. PMID: 12952463

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