2ZW5:
reference: Catalytic mechanism of bleomycin N-acetyltransferase proposed on the basis of its crystal structure., Oda K, Matoba Y, Noda M, Kumagai T, Sugiyama M, J Biol Chem. 2010 Jan 8;285(2):1446-56. Epub 2009 Nov 3. PMID: 19889644

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