6NSD:
reference: Biosynthesis of L-4-Chlorokynurenine, a Lipopeptide Antibiotic Non-Proteinogenic Amino Acid and Antidepressant Prodrug., Moore BS, Luhavaya H, Sigrist R, Chekan JR, McKinnie SMK, Angew Chem Int Ed Engl. 2019 Apr 8. doi: 10.1002/anie.201901571. PMID: 30963655

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