5GID:
reference: Regulation of the vitamin D receptor by vitamin D lactam derivatives., Asano L, Waku T, Abe R, Kuwabara N, Ito I, Yanagisawa J, Nagasawa K, Shimizu T, FEBS Lett. 2016 Sep;590(18):3270-9. doi: 10.1002/1873-3468.12348. Epub 2016 Aug, 23. PMID: 27500498

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