2WTA:
reference: Specificity and Mechanism of Acinetobacter baumanii Nicotinamidase: Implications for Activation of the Front-Line Tuberculosis Drug Pyrazinamide., Fyfe PK, Rao VA, Zemla A, Cameron S, Hunter WN, Angew Chem Int Ed Engl. 2009 Oct 26. PMID: 19859929

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