2R40:
reference: Critical Role of Desolvation in the Binding of 20-Hydroxyecdysone to the Ecdysone Receptor., Browning C, Martin E, Loch C, Wurtz JM, Moras D, Stote RH, Dejaegere AP, Billas IM, J Biol Chem. 2007 Nov 9;282(45):32924-32934. Epub 2007 Sep 11. PMID: 17848566

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