2HW2:
reference: Rifamycin antibiotic resistance by ADP-ribosylation: Structure and diversity of Arr., Baysarowich J, Koteva K, Hughes DW, Ejim L, Griffiths E, Zhang K, Junop M, Wright GD, Proc Natl Acad Sci U S A. 2008 Mar 25;105(12):4886-91. Epub 2008 Mar 18. PMID: 18349144

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