4MFH:
reference: Copper-sulfenate complex from oxidation of a cavity mutant of Pseudomonas aeruginosa azurin., Sieracki NA, Tian S, Hadt RG, Zhang JL, Woertink JS, Nilges MJ, Sun F, Solomon EI, Lu Y, Proc Natl Acad Sci U S A. 2014 Jan 21;111(3):924-9. doi: 10.1073/pnas.1316483111., Epub 2014 Jan 3. PMID: 24390543

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