4AD6:
reference: Exploring the chemical space around 8-mercaptoguanine as a route to new inhibitors of the folate biosynthesis enzyme HPPK., Chhabra S, Barlow N, Dolezal O, Hattarki MK, Newman J, Peat TS, Graham B, Swarbrick JD, PLoS One. 2013;8(4):e59535. doi: 10.1371/journal.pone.0059535. Epub 2013 Apr 2. PMID: 23565155

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