2PYA:
reference: Ultrahigh-resolution study on Pyrococcus abyssi rubredoxin: II. Introduction of an O-H...Sgamma-Fe hydrogen bond increased the reduction potential by 65 mV., Bonisch H, Schmidt CL, Bianco P, Ladenstein R, J Biol Inorg Chem. 2007 Nov;12(8):1163-71. Epub 2007 Aug 22. PMID: 17712580

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