1WCF:
reference: Structure of the Mycobacterium tuberculosis soluble inorganic pyrophosphatase Rv3628 at pH 7.0., Benini S, Wilson K, Acta Crystallogr Sect F Struct Biol Cryst Commun. 2011 Aug 1;67(Pt, 8):866-70. Epub 2011 Jul 26. PMID: 21821883

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