5NMA:
reference: Structure-activity relationship study of vitamin D analogs with oxolane group in their side chain., Belorusova AY, Martinez A, Gandara Z, Gomez G, Fall Y, Rochel N, Eur J Med Chem. 2017 Jul 7;134:86-96. doi: 10.1016/j.ejmech.2017.03.081. Epub, 2017 Apr 2. PMID: 28399453

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