1E4M:
reference: High resolution X-ray crystallography shows that ascorbate is a cofactor for myrosinase and substitutes for the function of the catalytic base., Burmeister WP, Cottaz S, Rollin P, Vasella A, Henrissat B, J Biol Chem 2000 Dec 15;275(50):39385-93. PMID: 10978344

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