6CGC:
reference: Combined Biophysical Chemistry Reveals a New Covalent Inhibitor with a Low-Reactivity Alkyl Halide., Li T, Maltais R, Poirier D, Lin SX, J Phys Chem Lett. 2018 Sep 20;9(18):5275-5280. doi: 10.1021/acs.jpclett.8b02225. , Epub 2018 Aug 31. PMID: 30148957

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