| 2RFH: reference: Nitro as a novel zinc-binding group in the inhibition of carboxypeptidase A., Wang SH, Wang SF, Xuan W, Zeng ZH, Jin JY, Ma J, Tian GR, Bioorg Med Chem. 2008 Apr 1;16(7):3596-601. Epub 2008 Feb 8. PMID: 18289863 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).