3VRT:
reference: Butyl pocket formation in the vitamin d receptor strongly affects the agonistic or antagonistic behavior of ligands., Yoshimoto N, Sakamaki Y, Haeta M, Kato A, Inaba Y, Itoh T, Nakabayashi M, Ito N, Yamamoto K, J Med Chem. 2012 May 10;55(9):4373-81. Epub 2012 Apr 27. PMID: 22512505

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