6FDU:
reference: Structural basis of substrate recognition and covalent inhibition of Cdu1 from Chlamydia trachomatis., Ramirez YA, Adler T, Altmann E, Tiesmeyer C, Klemm T, Sauer F, Kathman S, Statsyuk A, Sotriffer C, Kisker C, ChemMedChem. 2018 Jul 20. doi: 10.1002/cmdc.201800364. PMID: 30028574

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