5FDF:
reference: An extended loop in CE7 carbohydrate esterase family is dispensable for oligomerization but required for activity and thermostability., Singh MK, Manoj N, J Struct Biol. 2016 Jun;194(3):434-45. doi: 10.1016/j.jsb.2016.04.008. Epub 2016 , Apr 13. PMID: 27085421

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