3CYI:
reference: Reduction of Cysteine Sulfinic Acid in Peroxiredoxin by Sulfiredoxin Proceeds Directly through a Sulfinic Phosphoryl Ester Intermediate., Jonsson TJ, Murray MS, Johnson LC, Lowther WT, J Biol Chem. 2008 Aug 29;283(35):23846-51. Epub 2008 Jun 24. PMID: 18579529

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