5E7W:
reference: Ultra-high resolution X-ray structures of two forms of human recombinant insulin at 100 K., Lisgarten DR, Palmer RA, Lobley CMC, Naylor CE, Chowdhry BZ, Al-Kurdi ZI, Badwan AA, Howlin BJ, Gibbons NCJ, Saldanha JW, Lisgarten JN, Basak AK, Chem Cent J. 2017 Aug 1;11(1):73. doi: 10.1186/s13065-017-0296-y. PMID: 29086855

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