4FBX:
reference: A subnanomolar fluorescent probe for protein kinase CK2 interaction studies., Enkvist E, Viht K, Bischoff N, Vahter J, Saaver S, Raidaru G, Issinger OG, Niefind K, Uri A, Org Biomol Chem. 2012 Oct 2. PMID: 23032938

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