1WAN:
reference: Solution structure of a pyrimidine-purine-pyrimidine triplex containing the sequence-specific intercalating non-natural base D3., Wang E, Koshlap KM, Gillespie P, Dervan PB, Feigon J, J Mol Biol 1996 Apr 19;257(5):1052-69. PMID: 8632468

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).