5AZZ:
reference: Preparation of Selenoinsulin as a Long-Lasting Insulin Analogue., Arai K, Takei T, Okumura M, Watanabe S, Amagai Y, Asahina Y, Moroder L, Hojo H, Inaba K, Iwaoka M, Angew Chem Int Ed Engl. 2017 May 8;56(20):5522-5526. doi: 10.1002/anie.201701654., Epub 2017 Apr 10. PMID: 28394477

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