4QVG:
reference: Structure and mechanism of an antibiotics-synthesizing 3-hydroxykynurenine C-methyltransferase., Chen SC, Huang CH, Lai SJ, Liu JS, Fu PK, Tseng ST, Yang CS, Lai MC, Ko TP, Chen Y, Sci Rep. 2015 May 11;5:10100. doi: 10.1038/srep10100. PMID: 25960001

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