4YJ3:
reference: Structures of potent anticancer compounds bound to tubulin., McNamara DE, Senese S, Yeates TO, Torres JZ, Protein Sci. 2015 May 13. doi: 10.1002/pro.2704. PMID: 25970265

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