3HT1:
reference: The polyketide cyclase RemF from Streptomyces resistomycificus contains an unusual octahedral zinc binding site., Silvennoinen L, Sandalova T, Schneider G, FEBS Lett. 2009 Sep 3;583(17):2917-21. Epub 2009 Aug 6. PMID: 19665022

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