4OH3:
reference: Crystal structure of the plant dual-affinity nitrate transporter NRT1.1., Sun J, Bankston JR, Payandeh J, Hinds TR, Zagotta WN, Zheng N, Nature. 2014 Mar 6;507(7490):73-7. doi: 10.1038/nature13074. Epub 2014 Feb 26. PMID: 24572362

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