2DS1:
reference: Structure-based drug design of a highly potent CDK1,2,4,6 inhibitor with novel macrocyclic quinoxalin-2-one structure., Kawanishi N, Sugimoto T, Shibata J, Nakamura K, Masutani K, Ikuta M, Hirai H, Bioorg Med Chem Lett. 2006 Oct 1;16(19):5122-6. Epub 2006 Jul 28. PMID: 16876403

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