5TGS:
reference: 7-Carboxy-7-deazaguanine synthase - A radical S-adenosyl-L-methionine enzyme with polar tendencies., Bruender NA, Grell TA, Dowling DP, McCarty RM, Drennan CL, Bandarian V, J Am Chem Soc. 2017 Jan 3. doi: 10.1021/jacs.6b11381. PMID: 28045519

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