5MHH:
reference: Rational Design of an Anticalin-Type Sugar-Binding Protein Using a Genetically Encoded Boronate Side Chain., Edwardraja S, Eichinger A, Theobald I, Sommer CA, Reichert AJ, Skerra A, ACS Synth Biol. 2017 Sep 22. doi: 10.1021/acssynbio.7b00199. PMID: 28937743

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