6GFG:
reference: A Fluorescent Probe Identifies Active Site Ligands of Inositol Pentakisphosphate 2-Kinase., Whitfield H, Gilmartin M, Baker K, Riley AM, Godage HY, Potter BVL, Hemmings AM, Brearley CA, J Med Chem. 2018 Aug 30. doi: 10.1021/acs.jmedchem.8b01022. PMID: 30160967

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