1DCG:
reference: The molecular structure of the left-handed Z-DNA double helix at 1.0-A atomic resolution. Geometry, conformation, and ionic interactions of d(CGCGCG)., Gessner RV, Frederick CA, Quigley GJ, Rich A, Wang AH, J Biol Chem 1989 May 15;264(14):7921-35. PMID: 2722771

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