6KR5:
reference: Crystal structure of O-Acetylserine sulfhydralase (OASS) isoform 3 from Entamoeba histolytica: Pharmacophore-based virtual screening and validation of novel inhibitors., Dharavath S, Vijayan R, Kumari K, Tomar P, Gourinath S, Eur J Med Chem. 2020 Apr 15;192:112157. doi: 10.1016/j.ejmech.2020.112157. Epub, 2020 Feb 19. PMID: 32145643

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