5BSW:
reference: Structural Basis for Specificity and Flexibility in a Plant 4-Coumarate:CoA Ligase., Li Z, Nair SK, Structure. 2015 Nov 3;23(11):2032-42. doi: 10.1016/j.str.2015.08.012. Epub 2015, Sep 24. PMID: 26412334

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