4KRS:
reference: Structure-Efficiency Relationship of [1,2,4]Triazol-3-ylamines as Novel Nicotinamide Isosteres that Inhibit Tankyrases., Shultz MD, Majumdar D, Chin DN, Fortin PD, Feng Y, Gould T, Kirby CA, Stams T, Waters NJ, Shao W, J Med Chem. 2013 Aug 14. PMID: 23879431

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