400D:
reference: The intrinsic structure and stability of out-of-alternation base pairs in Z-DNA., Eichman BF, Schroth GP, Basham BE, Ho PS, Nucleic Acids Res 1999 Jan 15;27(2):543-50. PMID: 9862978

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