4ZFJ:
reference: Structure of the Ergothioneine-Biosynthesis Amidohydrolase EgtC., Vit A, Mashabela GT, Blankenfeldt W, Seebeck FP, Chembiochem. 2015 Jun 16. doi: 10.1002/cbic.201500168. PMID: 26079795

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