2FXP:
reference: Solution structure of the severe acute respiratory syndrome-coronavirus heptad repeat 2 domain in the prefusion state., Hakansson-McReynolds S, Jiang S, Rong L, Caffrey M, J Biol Chem. 2006 Apr 28;281(17):11965-71. Epub 2006 Feb 28. PMID: 16507566

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