5ZWH:
reference: Identification of the Histidine Residue in Vitamin D Receptor That Covalently Binds to Electrophilic Ligands., Yoshizawa M, Itoh T, Hori T, Kato A, Anami Y, Yoshimoto N, Yamamoto K, J Med Chem. 2018 Jul 11. doi: 10.1021/acs.jmedchem.8b00774. PMID: 29936834

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