5JC6:
reference: Structure of the carboxypeptidase B complex with N-sulfamoyl-L-phenylalanine - a transition state analog of non-specific substrate., Akparov V, Timofeev V, Khaliullin I, Svedas V, Kuranova I, J Biomol Struct Dyn. 2018 Mar;36(4):956-965. doi: 10.1080/07391102.2017.1304242. , Epub 2017 Apr 11. PMID: 28274181

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